diff --git a/Units/parser-openapi.r/crash-test.d/README b/Units/parser-openapi.r/crash-test.d/README
new file mode 100644
index 0000000000..0d2b11a720
--- /dev/null
+++ b/Units/parser-openapi.r/crash-test.d/README
@@ -0,0 +1,6 @@
+This is a crash test.
+The code is derived from puppet/spec/fixtures/unit/data_providers/environments/hiera_bad_syntax_yaml/data/bad.yaml.
+
+    REPO=https://github.com/puppetlabs/puppet.git
+    ALIGNMENT=6.2.0
+    LANGUAGES=Ruby,PuppetManifest
diff --git a/Units/parser-openapi.r/crash-test.d/input.yml b/Units/parser-openapi.r/crash-test.d/input.yml
new file mode 100644
index 0000000000..c343a51c8a
--- /dev/null
+++ b/Units/parser-openapi.r/crash-test.d/input.yml
@@ -0,0 +1 @@
+{x:
diff --git a/parsers/openapi.c b/parsers/openapi.c
index e9d34e2152..690f46228b 100644
--- a/parsers/openapi.c
+++ b/parsers/openapi.c
@@ -271,9 +271,12 @@ static void	openapiPlayStateMachine (struct sOpenAPISubparser *openapi,
 		switch (openapi->play_detection_state)
 		{
 		case DSTAT_LAST_KEY:
-			openapi->type_stack->key = parseKey(token);
 			TRACE_PRINT("  key: %s\n", (char*)token->data.scalar.value);
-			handleKey (openapi, token);
+			if (openapi->type_stack)
+			{
+				openapi->type_stack->key = parseKey(token);
+				handleKey (openapi, token);
+			}
 			break;
 		case DSTAT_LAST_VALUE:
 			TRACE_PRINT("  value: %s\n", (char*)token->data.scalar.value);