diff --git a/lib/checkautovariables.cpp b/lib/checkautovariables.cpp
index 68a1230d1..35c1d52da 100644
--- a/lib/checkautovariables.cpp
+++ b/lib/checkautovariables.cpp
@@ -243,7 +243,7 @@ bool CheckAutoVariables::returnTemporary(const Token *tok) const
     bool retvalue = false; // is there such a function that returns a value?
 
     for (scope = symbolDatabase->scopeList.begin(); !retref && scope != symbolDatabase->scopeList.end(); ++scope) {
-        if (scope->type == Scope::eFunction && scope->function->type != Function::eConstructor && scope->function->type != Function::eCopyConstructor) {
+        if (scope->type == Scope::eFunction && scope->function && scope->function->type != Function::eConstructor && scope->function->type != Function::eCopyConstructor) {
             if (scope->className == funcname) {
                 retref = scope->classDef->strAt(-1) == "&";
                 if (!retref) {
diff --git a/test/testautovariables.cpp b/test/testautovariables.cpp
index 0b143c5a4..9a644b93f 100644
--- a/test/testautovariables.cpp
+++ b/test/testautovariables.cpp
@@ -557,6 +557,12 @@ private:
               "    return foo();\n"
               "}");
         ASSERT_EQUALS("", errout.str());
+
+        // Don't crash with function in unknown scope (#4076)
+        check("X& a::Bar() {}"
+              "X& foo() {"
+              "    return Bar();"
+              "}");
     }
 
     void returnReference3() {