diff --git a/src/main/java/org/aksw/iguana/cc/query/source/QuerySource.java b/src/main/java/org/aksw/iguana/cc/query/source/QuerySource.java
index 430a024c..b89c0846 100644
--- a/src/main/java/org/aksw/iguana/cc/query/source/QuerySource.java
+++ b/src/main/java/org/aksw/iguana/cc/query/source/QuerySource.java
@@ -26,8 +26,6 @@ public abstract class QuerySource {
     final protected int hashCode;
 
     public QuerySource(Path path) {
-        if (path == null)
-            throw new IllegalArgumentException("Path for a query source must not be null.");
         this.path = path;
         this.hashCode = FileUtils.getHashcodeFromFileContent(path);
     }