diff --git a/src/common/abstract.logger.ts b/src/common/abstract.logger.ts
index 963bc35..b7f95e9 100644
--- a/src/common/abstract.logger.ts
+++ b/src/common/abstract.logger.ts
@@ -67,10 +67,10 @@ export abstract class AbstractLogger {
             if (tmpLogger.LoggerIdentity === this.LoggerIdentity)
                 return true;
             tmpLogger = tmpLogger.NextLogger;
-        } while (tmpLogger !== null || tmpLogger !== undefined)
+        } while (tmpLogger !== null && tmpLogger !== undefined)
         return false;
     }
 
     abstract processEvent(source: string, eventName: string, properties: any);
     abstract processException(source, error: Error, properties: any);
-}
\ No newline at end of file
+}