diff --git a/src/main/java/net/minecraftforge/fml/relauncher/CoreModManager.java b/src/main/java/net/minecraftforge/fml/relauncher/CoreModManager.java
index b673a1ac4e..cb64d02e39 100644
--- a/src/main/java/net/minecraftforge/fml/relauncher/CoreModManager.java
+++ b/src/main/java/net/minecraftforge/fml/relauncher/CoreModManager.java
@@ -364,7 +364,7 @@ public class CoreModManager {
                     continue;
 
                 String modSide = mfAttributes.getValue(LibraryManager.MODSIDE);
-                if (!"BOTH".equals(modSide) || FMLLaunchHandler.side().name().equals(modSide))
+                if (modSide != null && !"BOTH".equals(modSide) && !FMLLaunchHandler.side().name().equals(modSide))
                 {
                     FMLLog.log.debug("Mod {} has ModSide meta-inf value {}, and we're {} It will be ignored", coreMod.getName(), modSide, FMLLaunchHandler.side.name());
                     ignoredModFiles.add(coreMod.getName());
diff --git a/src/main/java/net/minecraftforge/fml/relauncher/libraries/LibraryManager.java b/src/main/java/net/minecraftforge/fml/relauncher/libraries/LibraryManager.java
index 1359ff01ed..3aed4602dd 100644
--- a/src/main/java/net/minecraftforge/fml/relauncher/libraries/LibraryManager.java
+++ b/src/main/java/net/minecraftforge/fml/relauncher/libraries/LibraryManager.java
@@ -220,7 +220,7 @@ public class LibraryManager
         attrs = jar.getManifest().getMainAttributes();
 
         String modSide = attrs.getValue(LibraryManager.MODSIDE);
-        if (!"BOTH".equals(modSide) || FMLLaunchHandler.side().name().equals(modSide))
+        if (modSide != null && !"BOTH".equals(modSide) && !FMLLaunchHandler.side().name().equals(modSide))
             return null;
 
         if (attrs.containsKey(MODCONTAINSDEPS))