diff --git a/ipinfo/handler.py b/ipinfo/handler.py
index 698a1d8..4276a22 100644
--- a/ipinfo/handler.py
+++ b/ipinfo/handler.py
@@ -111,7 +111,7 @@ def getDetails(self, ip_address=None, timeout=None):
             ip_address = ip_address.exploded
 
         # check if bogon.
-        if is_bogon(ip_address):
+        if ip_address and is_bogon(ip_address):
             details = {}
             details["ip"] = ip_address
             details["bogon"] = True
diff --git a/ipinfo/handler_async.py b/ipinfo/handler_async.py
index 299e300..170413a 100644
--- a/ipinfo/handler_async.py
+++ b/ipinfo/handler_async.py
@@ -136,7 +136,7 @@ async def getDetails(self, ip_address=None, timeout=None):
             ip_address = ip_address.exploded
 
         # check if bogon.
-        if is_bogon(ip_address):
+        if ip_address and is_bogon(ip_address):
             details = {}
             details["ip"] = ip_address
             details["bogon"] = True