diff --git a/main/manager_channels.c b/main/manager_channels.c
index c964033..a50c4f4 100644
--- a/main/manager_channels.c
+++ b/main/manager_channels.c
@@ -493,6 +493,12 @@ struct ast_str *ast_manager_build_channel_state_string_prefix(
 	char *connected_name;
 	int res;
 
+	if (!snapshot)
+	{
+		ast_log(AST_LOG_WARNING, "Call to ast_manager_build_channel_state_string_prefix with NULL snapshot!\n");
+		return NULL;
+	}
+
 	if (snapshot->tech_properties & AST_CHAN_TP_INTERNAL) {
 		return NULL;
 	}