diff --git a/src/tokenize.cpp b/src/tokenize.cpp
index e5689cde7..238a7e1f3 100644
--- a/src/tokenize.cpp
+++ b/src/tokenize.cpp
@@ -2558,6 +2558,12 @@ bool Tokenizer::simplifyIfNot()
         if (tok->str() == "(" || tok->str() == "||" || tok->str() == "&&")
         {
             tok = tok->next();
+            while (tok && tok->str() == "(")
+                tok = tok->next();
+
+            if (!tok)
+                break;
+
             if (Token::simpleMatch(tok, "0 == (") ||
                 Token::Match(tok, "0 == %var%"))
             {
diff --git a/test/testsimplifytokens.cpp b/test/testsimplifytokens.cpp
index f79573542..e40f89494 100644
--- a/test/testsimplifytokens.cpp
+++ b/test/testsimplifytokens.cpp
@@ -1005,6 +1005,8 @@ private:
         ASSERT_EQUALS("if ( b ( ) && ! a )", simplifyIfNot("if( b() && 0 == a )"));
         ASSERT_EQUALS("if ( ! ( a = b ) )", simplifyIfNot("if((a=b)==0)"));
         ASSERT_EQUALS("if ( ! x . y )", simplifyIfNot("if(x.y==0)"));
+        ASSERT_EQUALS("if ( ( ! x ) )", simplifyIfNot("if((x==0))"));
+        ASSERT_EQUALS("if ( ( ! x ) && ! y )", simplifyIfNot("if((x==0) && y==0)"));
     }