diff --git a/core/wasm_shims/pythonplugin/python_plugin_probe_main.cc b/core/wasm_shims/pythonplugin/python_plugin_probe_main.cc
index 6235051..15bdd20 100644
--- a/core/wasm_shims/pythonplugin/python_plugin_probe_main.cc
+++ b/core/wasm_shims/pythonplugin/python_plugin_probe_main.cc
@@ -16,6 +16,9 @@ int main() {
     if (plugin->configure(nullptr, nullptr) != PLUGIN_NO_SECTION) {
         return 6;
     }
+    if (plugin->last_errmsg() != "no section") {
+        return 23;
+    }
     if (plugin->configure("/tmp/cnc_sim_missing_python_plugin_probe.ini", "PYTHON") != PLUGIN_BAD_INIFILE) {
         return 7;
     }
@@ -33,6 +36,9 @@ int main() {
     if (plugin->configure(nullptr, "PYTHON") != PLUGIN_NO_INIFILE) {
         return 21;
     }
+    if (plugin->last_errmsg() != "no inifile") {
+        return 24;
+    }
     const char *ini = "/tmp/cnc_sim_python_plugin_probe.ini";
     {
         FILE *file = std::fopen(ini, "w");
@@ -77,6 +83,9 @@ int main() {
     if (plugin->last_exception().empty()) {
         return 12;
     }
+    if (plugin->last_exception() != handle_pyerror()) {
+        return 25;
+    }
     if (plugin->run_string("noop", retval, false) != PLUGIN_OK) {
         return 13;
     }