Hi, I've found the cause of this error. It only happens when the call into Kamailio KSR takes more time than the threshold set in 'latency_limit_action' of the main config file. In my case, the value is set to 100000 and I can trigger the issue by calling tls.reload through KSR.jsonrpc.exec(..) as follows: jsreload = dict() jsreload["jsonrpc"] = "2.0" jsreload["method"] = "tls.reload" jsreload["id"] = 1 KSR.jsonrpcs.exec(json.dumps(jsreload)) The problem is caused by a bug in the app_python3 module. In file apy_kemi.c, the code that prints the message indicating the threshold has been exceeded is causing a TypeError exception while trying to get the co_filename and co_name values from the python interpreter. To do so it uses PyBytes_AsString , which expects a Bytes value but receives a Unicode value, thus causing the TypeError exception. The fix is to use PyUnicode_AsUTF8 instead. I will by writing all the details in a bug report. With the fix in place, we get this: 45(329) INFO: app_python3 [apy_kemi.c:377]: sr_apy_kemi_exec_func(): alert - action KSR.jsonrpcs.exec(...) took too long [693547 ms] (file:/etc/kamailio/kamailio.py func:ksr_rtimer_dodebug line:507) instead of Null values for 'file:' and 'func:'. Plus, no more TypeError exception. Cheers, Michel Pelletier ________________________________ From: Michel Pelletier via sr-users &lt;sr-users(a)lists.kamailio.org&gt; Sent: Thursday, July 11, 2024 12:00 PM To: Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt; Cc: Michel Pelletier &lt;michelpelletier07(a)gmail.com&gt; Subject: [SR-Users] Kemi Python3 throws a TypeError Hello, Please help. I am using Kemi with the python3 module. I get random TypeError exceptions thrown within the Kamailio code. For example I have the following code: event = str(KSR.pv.get("$hdr(Event)")) log.logInfo( "KamailioStateful.ksr_request_route_loopback(): " + "Passing the request to the presence " + "publish handler for event: " + event ) rc = KSR.presence.handle_publish() if rc != 1: log.logError( "KamailioStateful.ksr_request_route_loopback(): " + "The presence publish handler returned " + "an error code: " + str(rc) ) This is what I see in the logs: 21(120) ERROR: PY3 {PUBLISH}: app_python3 [python_support.c:167]: python_handle_exception(): apy_exec: ksr_request_route((null)): Unhandled exception in the Python code: TypeError: expected bytes, str found The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/etc/kamailio/kamailio.py", line 91, in ksr_request_route return ksf.ksr_request_route(msg, "Loopback") ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/etc/kamailio/kamailio_stateful.py", line 100, in ksr_request_route return self.ksr_request_route_loopback(msg) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/etc/kamailio/kamailio_stateful.py", line 240, in ksr_request_route_loopback rc = KSR.presence.handle_publish() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ SystemError: <built-in function handle_publish> returned a result with an exception set If I put the offending line within a Try/Except it hides it but I would rather not see it not happen at all. Any Kemi Python3 users experiencing something similar? What could be causing this? Regards, Michel Pelletier