diff --git a/src/firewall/core/rich.py b/src/firewall/core/rich.py
index dacaeb9..eb4a2d2 100644
--- a/src/firewall/core/rich.py
+++ b/src/firewall/core/rich.py
@@ -379,7 +379,10 @@ class Rich_Rule(object):
                         raise FirewallError(errors.INVALID_RULE, "'family' attribute cannot have '%s' value. Use 'ipv4' or 'ipv6' instead." % attr_value)
                     self.family = attr_value
                 elif attr_name == 'priority':
-                    self.priority = int(attr_value)
+                    try:
+                        self.priority = int(attr_value)
+                    except ValueError:
+                        raise FirewallError(errors.INVALID_RULE, "invalid 'priority' attribute value '%s'." % attr_value)
                 elif attr_name:
                     if attr_name == 'protocol':
                         err_msg = "wrong 'protocol' usage. Use either 'rule protocol value=...' or  'rule [forward-]port protocol=...'."
diff --git a/src/tests/regression/regression.at b/src/tests/regression/regression.at
index 984d299..1c8f76a 100644
--- a/src/tests/regression/regression.at
+++ b/src/tests/regression/regression.at
@@ -30,3 +30,4 @@ m4_include([regression/gh330.at])
 m4_include([regression/gh599.at])
 m4_include([regression/rhbz1829104.at])
 m4_include([regression/rhbz1843398.at])
+m4_include([regression/rhbz1689429.at])
diff --git a/src/tests/regression/rhbz1689429.at b/src/tests/regression/rhbz1689429.at
new file mode 100644
index 0000000..5701607
--- /dev/null
+++ b/src/tests/regression/rhbz1689429.at
@@ -0,0 +1,12 @@
+FWD_START_TEST([rich rule invalid priority])
+AT_KEYWORDS(rich rhbz1689429)
+
+FWD_CHECK([--add-rich-rule='rule priority=foo accept'], 122, [],
+	  [Error: INVALID_RULE: invalid 'priority' attribute value 'foo'.
+])
+FWD_CHECK([--permanent --add-rich-rule='rule priority=foo accept'], 122, [],
+	  [Error: INVALID_RULE: invalid 'priority' attribute value 'foo'.
+])
+FWD_RELOAD
+
+FWD_END_TEST([ignore])