Version-Release number of selected component:
firewall-config-0.3.12-1.fc21

Additional info:
reporter:       libreport-2.3.0
cmdline:        /usr/bin/python -Es /usr/bin/firewall-config
executable:     /usr/bin/firewall-config
kernel:         3.17.4-301.fc21.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
firewall-config:2096:onChangeZone:TypeError: 'NoneType' object is not iterable

Traceback (most recent call last):
  File "/usr/bin/firewall-config", line 2096, in onChangeZone
    for item in sources:
TypeError: 'NoneType' object is not iterable

Local variables in innermost frame:
masquerade: False
name: 'time-exceeded'
_services: []
sources: None
default: False
_icmpblocks: []
interfaces: ['eth0']
args: (<TreeSelection object at 0x7f795d186d20 (GtkTreeSelection at 0x1d53b00)>,)
iter: None
self: <__main__.FirewallConfig object at 0x7f795d1fda90>
item: 'eth0'
builtin: False
icmpblocks: []
rules: []
services: ['dhcpv6-client', 'mdns', 'samba-client', 'ssh', 'vnc-server']
selected_zone: 'FedoraWorkstation'
ports: [['1025-65535', 'udp'], ['3389', 'tcp'], ['1025-65535', 'tcp'], ['8080', 'tcp'], ['8181', 'tcp']]
forward_ports: []

Potential duplicate: bug 1175806