diff --git a/src/fr/devinsy/statoolinfos/core/Configuration.java b/src/fr/devinsy/statoolinfos/core/Configuration.java
index ffe9cc7..f889edd 100644
--- a/src/fr/devinsy/statoolinfos/core/Configuration.java
+++ b/src/fr/devinsy/statoolinfos/core/Configuration.java
@@ -381,9 +381,9 @@ public class Configuration extends PathPropertyList
      *
      * @return the probe mode
      */
-    public ProbeMode getProbeMode()
+    public ProbePeriod getProbeMode()
     {
-        ProbeMode result;
+        ProbePeriod result;
 
         String value = get("conf.probe.mode");
 
@@ -393,7 +393,7 @@ public class Configuration extends PathPropertyList
         }
         else
         {
-            result = ProbeMode.valueOf(StringUtils.upperCase(value));
+            result = ProbePeriod.valueOf(StringUtils.upperCase(value));
         }
 
         //
diff --git a/src/fr/devinsy/statoolinfos/core/ProbeMode.java b/src/fr/devinsy/statoolinfos/core/ProbePeriod.java
similarity index 97%
rename from src/fr/devinsy/statoolinfos/core/ProbeMode.java
rename to src/fr/devinsy/statoolinfos/core/ProbePeriod.java
index 6d9bd80..198c58c 100644
--- a/src/fr/devinsy/statoolinfos/core/ProbeMode.java
+++ b/src/fr/devinsy/statoolinfos/core/ProbePeriod.java
@@ -21,7 +21,7 @@ package fr.devinsy.statoolinfos.core;
 /**
  * The Enum LogFilter.
  */
-public enum ProbeMode
+public enum ProbePeriod
 {
     FULL,
     TODAY,
diff --git a/src/fr/devinsy/statoolinfos/metrics/Prober.java b/src/fr/devinsy/statoolinfos/metrics/Prober.java
index ab43ded..125d121 100644
--- a/src/fr/devinsy/statoolinfos/metrics/Prober.java
+++ b/src/fr/devinsy/statoolinfos/metrics/Prober.java
@@ -35,7 +35,7 @@ import org.slf4j.LoggerFactory;
 
 import fr.devinsy.statoolinfos.core.Configuration;
 import fr.devinsy.statoolinfos.core.Factory;
-import fr.devinsy.statoolinfos.core.ProbeMode;
+import fr.devinsy.statoolinfos.core.ProbePeriod;
 import fr.devinsy.statoolinfos.core.StatoolInfosException;
 import fr.devinsy.statoolinfos.core.StatoolInfosUtils;
 import fr.devinsy.statoolinfos.metrics.http.HttpAccessLogAnalyzer;
@@ -97,115 +97,125 @@ public class Prober
 
         System.out.println("Targets=" + types.toStringWithBrackets());
 
-        PathCounters counters = new PathCounters();
-
-        //
-        if (types.containsAnyIgnoreCase("HttpAccessLog"))
+        if (configuration.getProbeMode() != null)
         {
-            logger.info("== Processing HttpAccessLog.");
-            String source = configuration.getProbeHttpAccessLogSource();
-            String patternRegex = configuration.getProbeHttpAccessLogPattern();
-            logger.info("source=[{}]", source);
-            logger.info("pattern=[{}]", patternRegex);
+            PathCounters counters = new PathCounters();
 
-            PathCounters data = HttpAccessLogAnalyzer.probe(source, patternRegex);
-            counters.putAll(data);
-        }
-
-        //
-        if (types.containsAnyIgnoreCase("HttpErrorLog"))
-        {
-            logger.info("== Processing HttpErrorLog.");
-            String source = configuration.getProbeHttpErrorLogSource();
-            logger.info("source=[{}]", source);
-
-            PathCounters data = HttpErrorLogAnalyzer.probe(source);
-            counters.putAll(data);
-        }
-
-        //
-        if (types.containsAnyIgnoreCase("Framadate"))
-        {
-            logger.info("== Processing Framadate.");
-            String source = configuration.getProbeHttpErrorLogSource();
-            logger.info("source=[{}]", source);
-
-            // PathCounters data = HttpErrorLogAnalyzer.probe(source);
-            // counters.putAll(data);
-        }
-
-        //
-        if (types.containsAnyIgnoreCase("Mumble"))
-        {
-            logger.info("== Processing Mumble.");
-            String source = configuration.getProbeHttpErrorLogSource();
-            logger.info("source=[{}]", source);
-
-            // PathCounters data = HttpErrorLogAnalyzer.probe(source);
-            // counters.putAll(data);
-        }
-
-        // Filter.
-        logger.info("== Filtering");
-        if (configuration.getProbeMode() == ProbeMode.TODAY)
-        {
-            logger.info("=== TODAY");
-            counters = counters.searchByPeriod(LocalDate.now(), LocalDate.now());
-        }
-        else if (configuration.getProbeMode() == ProbeMode.PREVIOUS_DAY)
-        {
-            logger.info("=== PREVIOUS_DAY");
-            counters = counters.searchByPeriod(LocalDate.now().minusDays(1), LocalDate.now());
-        }
-        else if (configuration.getProbeMode() == ProbeMode.PREVIOUS_DAYS_7)
-        {
-            logger.info("=== PREVIOUS_WEEK");
-            counters = counters.searchByPeriod(LocalDate.now().minusDays(7), LocalDate.now());
-        }
-
-        //
-        File target = configuration.getProbeTarget();
-        logger.info("target=[{}]", target);
-
-        if (target == null)
-        {
-            throw new IllegalArgumentException("Undefined target.");
-        }
-        else
-        {
-            if (target.exists())
+            //
+            if (types.containsAnyIgnoreCase("HttpAccessLog"))
             {
-                logger.info("ModeProbe=" + configuration.getProbeMode());
-                if (configuration.getProbeMode() != ProbeMode.FULL)
-                {
-                    // Load.
-                    logger.info("== Reading previous target file.");
-                    PathCounters previousCounters = readMetrics(target);
-                    logger.info("previous size={}", previousCounters.size());
+                logger.info("== Processing HttpAccessLog.");
+                String source = configuration.getProbeHttpAccessLogSource();
+                String patternRegex = configuration.getProbeHttpAccessLogPattern();
+                logger.info("source=[{}]", source);
+                logger.info("pattern=[{}]", patternRegex);
 
-                    // Merge.
-                    logger.info("== Merging");
-                    for (PathCounter counter : counters.values())
+                PathCounters data = HttpAccessLogAnalyzer.probe(source, patternRegex);
+                counters.putAll(data);
+            }
+
+            //
+            if (types.containsAnyIgnoreCase("HttpErrorLog"))
+            {
+                logger.info("== Processing HttpErrorLog.");
+                String source = configuration.getProbeHttpErrorLogSource();
+                logger.info("source=[{}]", source);
+
+                PathCounters data = HttpErrorLogAnalyzer.probe(source);
+                counters.putAll(data);
+            }
+
+            //
+            if (types.containsAnyIgnoreCase("Framadate"))
+            {
+                logger.info("== Processing Framadate.");
+                String source = configuration.getProbeHttpErrorLogSource();
+                logger.info("source=[{}]", source);
+
+                // PathCounters data = HttpErrorLogAnalyzer.probe(source);
+                // counters.putAll(data);
+            }
+
+            //
+            if (types.containsAnyIgnoreCase("Mumble"))
+            {
+                logger.info("== Processing Mumble.");
+                String source = configuration.getProbeHttpErrorLogSource();
+                logger.info("source=[{}]", source);
+
+                // PathCounters data = HttpErrorLogAnalyzer.probe(source);
+                // counters.putAll(data);
+            }
+
+            // Filter.
+            logger.info("== Filtering");
+            if (configuration.getProbeMode() == ProbePeriod.TODAY)
+            {
+                logger.info("=== TODAY");
+                counters = counters.searchByPeriod(LocalDate.now(), LocalDate.now());
+            }
+            else if (configuration.getProbeMode() == ProbePeriod.PREVIOUS_DAY)
+            {
+                logger.info("=== PREVIOUS_DAY");
+                counters = counters.searchByPeriod(LocalDate.now().minusDays(1), LocalDate.now());
+            }
+            else if (configuration.getProbeMode() == ProbePeriod.PREVIOUS_DAYS_7)
+            {
+                logger.info("=== PREVIOUS_WEEK");
+                counters = counters.searchByPeriod(LocalDate.now().minusDays(7), LocalDate.now());
+            }
+
+            //
+            File target = configuration.getProbeTarget();
+            logger.info("target=[{}]", target);
+
+            if (target == null)
+            {
+                throw new IllegalArgumentException("Undefined target.");
+            }
+            else
+            {
+                if (target.exists())
+                {
+                    logger.info("ModeProbe=" + configuration.getProbeMode());
+                    if (configuration.getProbeMode() != ProbePeriod.FULL)
                     {
-                        PathCounter previousCounter = previousCounters.get(counter.getPath(), counter.getTimeMark());
-                        previousCounter.setCounter(counter.getCounter());
+                        // Load.
+                        logger.info("== Reading previous target file.");
+                        PathCounters previousCounters = readMetrics(target);
+                        logger.info("previous size={}", previousCounters.size());
+
+                        // Merge.
+                        logger.info("== Merging");
+                        for (PathCounter counter : counters.values())
+                        {
+                            PathCounter previousCounter = previousCounters.get(counter.getPath(), counter.getTimeMark());
+                            if (previousCounter == null)
+                            {
+                                previousCounters.put(counter);
+                            }
+                            else
+                            {
+                                previousCounter.setCounter(counter.getCounter());
+                            }
+                        }
+
+                        //
+                        counters = previousCounters;
                     }
 
                     //
-                    counters = previousCounters;
+                    logger.info("== Backing previous target file.");
+                    target.renameTo(new File(target.getParentFile(), target.getName() + ".bak"));
                 }
 
-                //
-                logger.info("== Backing previous target file.");
-                target.renameTo(new File(target.getParentFile(), target.getName() + ".bak"));
+                writeMetrics(target, counters);
             }
 
-            writeMetrics(target, counters);
+            //
+            logger.info("== Writing.");
+            logger.info("size={}", counters.size());
         }
-
-        //
-        logger.info("== Writing.");
-        logger.info("size={}", counters.size());
     }
 
     /**