diff --git a/src/sonic-bgpcfgd/staticroutebfd/main.py b/src/sonic-bgpcfgd/staticroutebfd/main.py
index e3b2ed10be30..2d7006420eb9 100644
--- a/src/sonic-bgpcfgd/staticroutebfd/main.py
+++ b/src/sonic-bgpcfgd/staticroutebfd/main.py
@@ -373,7 +373,7 @@ def static_route_set_handler(self, key, data):
 
         valid, is_ipv4, ip = check_ip(ip_prefix)
         if not valid:
-            log_err("invalid ip prefix for static route: ", key)
+            log_err("invalid ip prefix for static route: '%s'"%(key))
             return True
 
         arg_list  = lambda v: [x.strip() for x in v.split(',')] if len(v.strip()) != 0 else None
diff --git a/src/sonic-bgpcfgd/tests/test_static_rt_bfd.py b/src/sonic-bgpcfgd/tests/test_static_rt_bfd.py
index 11009aae0289..24f88bade1c6 100644
--- a/src/sonic-bgpcfgd/tests/test_static_rt_bfd.py
+++ b/src/sonic-bgpcfgd/tests/test_static_rt_bfd.py
@@ -95,6 +95,23 @@ def intf_setup(dut):
         {}
     )
 
+@patch('staticroutebfd.main.log_err')
+def test_invalid_key(mocked_log_err):
+    dut = constructor()
+    intf_setup(dut)
+
+    set_del_test(dut, "srt",
+        "SET",
+        ("2.2.2/24", {
+            "bfd": "true",
+            "nexthop": "192.168.1.2 , 192.168.2.2, 192.168.3.2",
+            "ifname": "if1, if2, if3",
+        }),
+        {},
+        {}
+    )
+    mocked_log_err.assert_called_with("invalid ip prefix for static route: '2.2.2/24'")
+
 def test_set_del():
     dut = constructor()
     intf_setup(dut)