diff --git a/src/fr/devinsy/statoolinfos/metrics/http/HttpAccessLogAnalyzer.java b/src/fr/devinsy/statoolinfos/metrics/http/HttpAccessLogAnalyzer.java
index b397560..20386ab 100644
--- a/src/fr/devinsy/statoolinfos/metrics/http/HttpAccessLogAnalyzer.java
+++ b/src/fr/devinsy/statoolinfos/metrics/http/HttpAccessLogAnalyzer.java
@@ -138,7 +138,7 @@ public class HttpAccessLogAnalyzer
 
         //
         Pattern pattern;
-        if (patternRegex == null)
+        if (StringUtils.isBlank(patternRegex))
         {
             pattern = HttpAccessLogParser.COMBINED_PATTERN;
         }