diff --git a/lib/utils/crawler.py b/lib/utils/crawler.py
index b8241bb46..383688219 100644
--- a/lib/utils/crawler.py
+++ b/lib/utils/crawler.py
@@ -102,7 +102,10 @@ class Crawler:
                 logger.info("searching for links with depth %d" % (i + 1))
                 runThreads(numThreads, crawlThread)
                 clearConsoleLine(True)
-                threadData.shared.unprocessed = set(threadData.shared.deeper)
+                if threadData.shared.deeper:
+                    threadData.shared.unprocessed = set(threadData.shared.deeper)
+                else:
+                    break
 
         except KeyboardInterrupt:
             warnMsg = "user aborted during crawling. sqlmap "