diff --git a/core/tests/sems_tests.cpp b/core/tests/sems_tests.cpp
index 37e98e97..109a0b0e 100644
--- a/core/tests/sems_tests.cpp
+++ b/core/tests/sems_tests.cpp
@@ -19,10 +19,10 @@
 
 FCT_BGN() {
   init_logging();
-  log_stderr = true;
-  log_level = 3;
-
+  log_stderr=true;
+  log_level=3;
   FCTMF_SUITE_CALL(test_headers);
+  FCTMF_SUITE_CALL(test_jsonarg);
 } FCT_END();
 
 
diff --git a/core/tests/test_jsonarg.cpp b/core/tests/test_jsonarg.cpp
new file mode 100644
index 00000000..c803c695
--- /dev/null
+++ b/core/tests/test_jsonarg.cpp
@@ -0,0 +1,18 @@
+#include "fct.h"
+
+#include "AmSipHeaders.h"
+#include "AmSipMsg.h"
+#include "jsonArg.h"
+
+
+FCTMF_SUITE_BGN(test_jsonarg) {
+
+    FCT_TEST_BGN(json_parse_escaped) {
+      string s = "{\"jsonrpc\": \"2.0\", \"id\": \"11\", \"error\": {\"message\": \"(1062, \\\"Duplicate entry '5447' for key 'PRIMARY'\\\")\", \"code\": -32603}},";
+      DBG("s='%s'\n",s.c_str());
+		
+      AmArg rpc_params;
+      fct_chk(json2arg(s.c_str(), rpc_params));
+    } FCT_TEST_END();
+
+} FCTMF_SUITE_END();
diff --git a/core/tests/test_jsonarg.h b/core/tests/test_jsonarg.h
new file mode 100644
index 00000000..8b137891
--- /dev/null
+++ b/core/tests/test_jsonarg.h
@@ -0,0 +1 @@
+