diff --git a/src/transcription-filter.cpp b/src/transcription-filter.cpp
index df98c6e..0b16f64 100644
--- a/src/transcription-filter.cpp
+++ b/src/transcription-filter.cpp
@@ -177,7 +177,7 @@ void acquire_weak_text_source_ref(struct transcription_filter_data *gf)
 
 void set_text_callback(struct transcription_filter_data *gf, const std::string &str)
 {
-	if (gf->output_file_path != "") {
+	if (gf->output_file_path != "" && !gf->text_source_name) {
 		// Write to file, do not append
 		std::ofstream output_file(gf->output_file_path, std::ios::out | std::ios::trunc);
 		output_file << str;
@@ -226,7 +226,8 @@ void transcription_filter_update(void *data, obs_data_t *s)
 	const char *new_text_source_name = obs_data_get_string(s, "subtitle_sources");
 	obs_weak_source_t *old_weak_text_source = NULL;
 
-	if (strcmp(new_text_source_name, "none") == 0 ||
+	if (new_text_source_name == nullptr ||
+        strcmp(new_text_source_name, "none") == 0 ||
 	    strcmp(new_text_source_name, "(null)") == 0 ||
 	    strcmp(new_text_source_name, "text_file") == 0 || strlen(new_text_source_name) == 0) {
 		// new selected text source is not valid, release the old one
@@ -266,6 +267,11 @@ void transcription_filter_update(void *data, obs_data_t *s)
 				old_weak_text_source = gf->text_source;
 				gf->text_source = nullptr;
 			}
+            if (gf->text_source_name) {
+                // free the old text source name
+                bfree(gf->text_source_name);
+                gf->text_source_name = nullptr;
+            }
 			gf->text_source_name = bstrdup(new_text_source_name);
 		}
 	}
@@ -413,6 +419,7 @@ void *transcription_filter_create(obs_data_t *settings, obs_source_t *filter)
 	gf->text_source_mutex = new std::mutex();
 	gf->text_source = nullptr;
 	gf->text_source_name = bstrdup(obs_data_get_string(settings, "subtitle_sources"));
+    gf->output_file_path = std::string("");
 
 	obs_log(gf->log_level, "transcription_filter: run update");
 	// get the settings updated on the filter data struct