diff --git a/lib/library.cpp b/lib/library.cpp
index 4d6ae5a4eb3..07270b7e520 100644
--- a/lib/library.cpp
+++ b/lib/library.cpp
@@ -1512,7 +1512,7 @@ Library::ArgumentChecks::Direction Library::getArgDirection(const Token* ftok, i
     const ArgumentChecks* arg = getarg(ftok, argnr);
     if (arg) {
         if (indirect < 0 || indirect >= arg->direction.size())
-            throw InternalError(ftok, "Bad indirect value: " + std::to_string(indirect));
+            return ArgumentChecks::Direction::DIR_UNKNOWN; // TODO: don't generate bad indirect values
         return arg->direction[indirect];
     }
     if (formatstr_function(ftok)) {
diff --git a/test/cfg/std.c b/test/cfg/std.c
index f795cdc5bda..193339e9a58 100644
--- a/test/cfg/std.c
+++ b/test/cfg/std.c
@@ -320,6 +320,15 @@ void bufferAccessOutOfBounds_libraryDirectionConfiguration(void)
     arr[c] = 'x';
 }
 
+void internalError_libraryDirectionConfiguration(char* str) { // #12824
+    const char* s = str;
+    char* end = str;
+    if (1) {
+        // cppcheck-suppress unreadVariable
+        unsigned long val = strtoul(&s[1], &end, 10);
+    }
+}
+
 void arrayIndexOutOfBounds()
 {
     char * pAlloc1 = aligned_alloc(8, 16);
diff --git a/test/cfg/std.cpp b/test/cfg/std.cpp
index 0e1f205d2cb..d11d9edb42d 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -5070,3 +5070,8 @@ void constVariablePointer_push_back(std::vector<T*>& d, const std::vector<T*>& s
         d.push_back(newE);
     }
 }
+
+// cppcheck-suppress constParameterReference
+void constParameterReference_push_back(std::vector<std::string>& v, std::string& s) { // #12661
+    v.push_back(s);
+}