Index: compile_rules_graph.py
==================================================================
--- compile_rules_graph.py
+++ compile_rules_graph.py
@@ -383,12 +383,13 @@
             # new rule group
             m = re.match("__(\\w+)(!\\d|)__", sLine)
             if m:
                 sRuleName = m.group(1)
                 if sRuleName in aRuleName:
-                    print("Error at line " + i + ". Rule name <" + sRuleName + "> already exists.")
+                    print("Error at line " + str(i) + ". Rule name <" + sRuleName + "> already exists.")
                     exit()
+                aRuleName.add(sRuleName)
                 iActionBlock = 1
                 nPriority = int(m.group(2)[1:]) if m.group(2)  else -1
             else:
                 print("Syntax error in rule group: ", sLine, " -- line:", i)
                 exit()