diff --git a/AK/String.cpp b/AK/String.cpp
index 76ce98b4b5..5bd3a98da2 100644
--- a/AK/String.cpp
+++ b/AK/String.cpp
@@ -312,6 +312,8 @@ bool String::matches(const StringView& mask, CaseSensitivity case_sensitivity) c
 
 bool String::contains(const String& needle) const
 {
+    if (is_null() || needle.is_null())
+        return false;
     return strstr(characters(), needle.characters());
 }