diff --git a/lib/checkother.cpp b/lib/checkother.cpp
index 6fd61e395..7a6a800a3 100644
--- a/lib/checkother.cpp
+++ b/lib/checkother.cpp
@@ -364,7 +364,7 @@ void CheckOther::clarifyStatement()
     const std::size_t functions = symbolDatabase->functionScopes.size();
     for (std::size_t i = 0; i < functions; ++i) {
         const Scope * scope = symbolDatabase->functionScopes[i];
-        for (const Token* tok = scope->classStart; tok != scope->classEnd; tok = tok->next()) {
+        for (const Token* tok = scope->classStart; tok && tok != scope->classEnd; tok = tok->next()) {
             if (Token::Match(tok, "* %var%")) {
                 const Token *tok2=tok->previous();
 
diff --git a/test/testother.cpp b/test/testother.cpp
index a135c8c1f..6bb7a6b62 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -4250,6 +4250,10 @@ private:
               "    bar(**c++);\n"
               "}");
         ASSERT_EQUALS("", errout.str());
+
+        // #5166 segmentation fault (invalid code) in lib/checkother.cpp:329 ( void * f { } void b ( ) { * f } )
+        check("void * f { } void b ( ) { * f }");
+        ASSERT_EQUALS("", errout.str());
     }
 
     // clarify conditions with = and comparison