diff --git a/strings/knuth_morris_pratt.py b/strings/knuth_morris_pratt.py
index 5120779c571e..cff96f52ece0 100644
--- a/strings/knuth_morris_pratt.py
+++ b/strings/knuth_morris_pratt.py
@@ -22,6 +22,9 @@ def knuth_morris_pratt(text: str, pattern: str) -> int:
     True
     """
 
+    if not pattern:
+        return 0
+
     # 1) Construct the failure array
     failure = get_failure_array(pattern)