diff --git a/apps/fft-multi-decoder_fixed_hackrf.grc b/apps/fft-multi-decoder_fixed_hackrf.grc
index adddc17..6f15ef8 100644
--- a/apps/fft-multi-decoder_fixed_hackrf.grc
+++ b/apps/fft-multi-decoder_fixed_hackrf.grc
@@ -3170,7 +3170,7 @@ class blk(gr.sync_block):  # other base classes are basic_block, decim_block, in
     </param>
     <param>
       <key>writeDB</key>
-      <value>False</value>
+      <value>True</value>
     </param>
   </block>
   <block>
@@ -3244,7 +3244,7 @@ class blk(gr.sync_block):  # other base classes are basic_block, decim_block, in
     </param>
     <param>
       <key>_enabled</key>
-      <value>0</value>
+      <value>1</value>
     </param>
     <param>
       <key>_coordinate</key>
diff --git a/python/rds_parser_table_qt.py b/python/rds_parser_table_qt.py
index 3f44764..37a86cd 100644
--- a/python/rds_parser_table_qt.py
+++ b/python/rds_parser_table_qt.py
@@ -105,6 +105,7 @@ class rds_parser_table_qt(gr.sync_block):#START
             db_name=workdir+'RDS_data'+datetime.now().strftime("%Y%m%d_%H%M%S")+'.db'
             db=sqlite3.connect(db_name, check_same_thread=False)
             self.db=db
+            self.dbLock=QtCore.QSemaphore(1)
             #create tables
             try:
                 db.execute('''CREATE TABLE stations
@@ -186,7 +187,9 @@ class rds_parser_table_qt(gr.sync_block):#START
             self.PI_dict[PI]-=1
         #print(self.PI_dict)
         if self.writeDB:
+            self.dbLock.acquire(1)
             self.db.commit()
+            self.dbLock.release(1)
     def update_freq(self):
             #  "&#9;" is a tab character
         message_string="decoder frequencies:"
@@ -299,6 +302,7 @@ class rds_parser_table_qt(gr.sync_block):#START
             #self.signals.DataUpdateEvent.emit({'group_count':self.minute_count,'group_count_max':self.minute_count_max})
             if self.writeDB:
                 #db=sqlite3.connect(self.db_name)
+                #self.dbLock.acquire(1)
                 db=self.db
 
 
@@ -974,6 +978,8 @@ class rds_parser_table_qt(gr.sync_block):#START
                 #print("group of type %s not decoded on station %s"% (groupType,PI))
 
             pr.disable() #disabled-internal-profiling
+            #if self.writeDB:
+            #    self.dbLock.release(1)
             #end of handle_msg
     def print_results(self):
         s = StringIO.StringIO()