diff --git a/reactos/dll/win32/kernel32/winnls/string/lstring.c b/reactos/dll/win32/kernel32/winnls/string/lstring.c
index 90e2493a511..3b1d29c511b 100644
--- a/reactos/dll/win32/kernel32/winnls/string/lstring.c
+++ b/reactos/dll/win32/kernel32/winnls/string/lstring.c
@@ -27,7 +27,8 @@ lstrcmpA(LPCSTR lpString1, LPCSTR lpString2)
         return 1;
 
     Result = CompareStringA(GetThreadLocale(), 0, lpString1, -1, lpString2, -1);
-    if (Result) Result -= 2;
+    if (Result)
+        Result -= 2;
 
     return Result;
 }
@@ -56,6 +57,7 @@ lstrcmpiA(LPCSTR lpString1, LPCSTR lpString2)
     return Result;
 }
 
+
 /*
  * @implemented
  */
@@ -144,6 +146,9 @@ lstrlenA(LPCSTR lpString)
 {
     INT Ret = 0;
 
+    if (lpString == NULL)
+        return 0;
+
     _SEH2_TRY
     {
         Ret = strlen(lpString);
@@ -292,6 +297,9 @@ lstrlenW(LPCWSTR lpString)
 {
     INT Ret = 0;
 
+    if (lpString == NULL)
+        return 0;
+
     _SEH2_TRY
     {
         Ret = wcslen(lpString);