diff --git a/netfields/fields.py b/netfields/fields.py
index 42800eb..47cd82c 100644
--- a/netfields/fields.py
+++ b/netfields/fields.py
@@ -192,7 +192,7 @@ def to_python(self, value):
 
         try:
             return EUI(value, dialect=mac_unix_common)
-        except AddrFormatError as e:
+        except (AddrFormatError, IndexError, TypeError) as e:
             raise ValidationError(e)
 
     def get_prep_value(self, value):
@@ -238,7 +238,7 @@ def to_python(self, value):
 
         try:
             return EUI(value, dialect=mac_eui64)
-        except AddrFormatError as e:
+        except (AddrFormatError, IndexError, TypeError) as e:
             raise ValidationError(e)
 
     def get_prep_value(self, value):
diff --git a/netfields/rest_framework.py b/netfields/rest_framework.py
index 3b6f1be..bfce87f 100644
--- a/netfields/rest_framework.py
+++ b/netfields/rest_framework.py
@@ -74,7 +74,7 @@ def to_internal_value(self, data):
             return data
         try:
             return EUI(data, dialect=mac_unix_common)
-        except (AddrFormatError, TypeError):
+        except (AddrFormatError, IndexError, TypeError):
             self.fail('invalid')
 
 
@@ -93,7 +93,7 @@ def to_internal_value(self, data):
             return data
         try:
             return EUI(data, dialect=mac_eui64)
-        except (AddrFormatError, TypeError):
+        except (AddrFormatError, IndexError, TypeError):
             self.fail('invalid')