diff --git a/aws_visualizer/dot/graph_region.py b/aws_visualizer/dot/graph_region.py
index ca920ce..9f50f5d 100644
--- a/aws_visualizer/dot/graph_region.py
+++ b/aws_visualizer/dot/graph_region.py
@@ -253,13 +253,13 @@ def load_assigned_security_groups(self):
         self.assigned_security_groups = {}
         for instance in self.instances:
             self.assigned_security_groups[instance] = list(map(
-                lambda g: SecurityGroup(g), instance['SecurityGroups']))
+                lambda g: SecurityGroup(g), instance.get('SecurityGroups', [])))
 
     def load_assigned_lb_security_groups(self):
         self.assigned_lb_security_groups = {}
         for lb in self.loadbalancers:
             self.assigned_lb_security_groups[lb] = list(map(
-                lambda g: self.get_security_group_by_id(g), lb['SecurityGroups']))
+                lambda g: self.get_security_group_by_id(g), lb.get('SecurityGroups', [])))
 
     def get_networks_of_rule_refering_to_external_address(self, vpc, rule):
         cidrs = rule['IpRanges'] if 'IpRanges' in rule else set()
@@ -371,7 +371,7 @@ def load_security_table_of_vpc(self, vpc_id):
                 self._add_security_group_to_table(instance, group)
 
         for loadbalancer in self.get_loadbalancers_in_vpc(vpc_id):
-            for sg in loadbalancer['SecurityGroups']:
+            for sg in loadbalancer.get('SecurityGroups', []):
                 group = self.get_security_group_by_id(sg)
                 self._add_security_group_to_table(loadbalancer, group)