diff --git a/src/pl/plpython/plpy_exec.c b/src/pl/plpython/plpy_exec.c
index 923703535a..7181b5e898 100644
--- a/src/pl/plpython/plpy_exec.c
+++ b/src/pl/plpython/plpy_exec.c
@@ -414,12 +414,12 @@ PLy_function_build_args(FunctionCallInfo fcinfo, PLyProcedure *proc)
 	PyObject   *volatile args = NULL;
 	int			i;
 
+	args = PyList_New(proc->nargs);
+	if (!args)
+		return NULL;
+
 	PG_TRY();
 	{
-		args = PyList_New(proc->nargs);
-		if (!args)
-			return NULL;
-
 		for (i = 0; i < proc->nargs; i++)
 		{
 			PLyDatumToOb *arginfo = &proc->args[i];
@@ -684,18 +684,28 @@ PLy_trigger_build_args(FunctionCallInfo fcinfo, PLyProcedure *proc, HeapTuple *r
 			   *pltrelid,
 			   *plttablename,
 			   *plttableschema;
-	PyObject   *pltargs,
+	PyObject   *pltargs = NULL,
 			   *pytnew,
 			   *pytold;
 	PyObject   *volatile pltdata = NULL;
 	char	   *stroid;
 
-	PG_TRY();
+	pltdata = PyDict_New();
+	if (!pltdata)
+		return NULL;
+
+	if (tdata->tg_trigger->tgnargs)
 	{
-		pltdata = PyDict_New();
-		if (!pltdata)
+		pltargs = PyList_New(tdata->tg_trigger->tgnargs);
+		if (!pltargs)
+		{
+			Py_DECREF(pltdata);
 			return NULL;
+		}
+	}
 
+	PG_TRY();
+	{
 		pltname = PLyUnicode_FromString(tdata->tg_trigger->tgname);
 		PyDict_SetItemString(pltdata, "name", pltname);
 		Py_DECREF(pltname);
@@ -835,12 +845,6 @@ PLy_trigger_build_args(FunctionCallInfo fcinfo, PLyProcedure *proc, HeapTuple *r
 			int			i;
 			PyObject   *pltarg;
 
-			pltargs = PyList_New(tdata->tg_trigger->tgnargs);
-			if (!pltargs)
-			{
-				Py_DECREF(pltdata);
-				return NULL;
-			}
 			for (i = 0; i < tdata->tg_trigger->tgnargs; i++)
 			{
 				pltarg = PLyUnicode_FromString(tdata->tg_trigger->tgargs[i]);