diff --git a/jc/parsers/arp.py b/jc/parsers/arp.py
index bde1598b..f271eacd 100644
--- a/jc/parsers/arp.py
+++ b/jc/parsers/arp.py
@@ -60,7 +60,7 @@ $ arp -a | jc --arp -p
 def process(proc_data):
     # in BSD style, change name to null if it is a question mark
     for entry in proc_data:
-        if entry['name'] and entry['name'] == '?':
+        if 'name' in entry and entry['name'] == '?':
             entry['name'] = None
 
     return proc_data
diff --git a/jc/parsers/df.py b/jc/parsers/df.py
index 60702849..a1b8edfe 100644
--- a/jc/parsers/df.py
+++ b/jc/parsers/df.py
@@ -56,7 +56,7 @@ def process(proc_data):
                     entry[k] = None
 
         # change 'used' to int
-        if entry['used']:
+        if 'used' in entry:
             try:
                 used_int = int(entry['used'])
                 entry['used'] = used_int
@@ -64,7 +64,7 @@ def process(proc_data):
                 entry['used'] = None
 
         # change 'available' to int
-        if entry['available']:
+        if 'available' in entry:
             try:
                 available_int = int(entry['available'])
                 entry['available'] = available_int
@@ -72,7 +72,7 @@ def process(proc_data):
                 entry['available'] = None
 
         # remove percent sign from 'use_percent' and change to int
-        if entry['use_percent']:
+        if 'use_percent' in entry:
             try:
                 use_percent_int = entry['use_percent'].rstrip('%')
                 use_percent_int = int(use_percent_int)