--- ../src_base/minecraft/net/minecraft/block/BlockPortal.java
+++ ../src_work/minecraft/net/minecraft/block/BlockPortal.java
@@ -118,7 +118,7 @@
         }
         else
         {
-            if (par1World.getBlockId(par2 - b0, par3, par4 - b1) == 0)
+            if (par1World.isAirBlock(par2 - b0, par3, par4 - b1))
             {
                 par2 -= b0;
                 par4 -= b1;

Fix isAir check to see if a portal can light. Should fix w/Railcraft and others
Fix isAir check to see if a portal can light. Should fix w/Railcraft and others
