[1.10.2] Crash (NullPointerException) when opening non-empty ProjectRed backpack

[Tommsy64]

When I try opening a ProjectRed backpack that contains at least one item, my game crashes:

java.lang.NullPointerException: Unexpected error
    at scala.collection.mutable.ArrayOps$ofRef$.length$extension(ArrayOps.scala:192)
    at scala.collection.mutable.ArrayOps$ofRef.length(ArrayOps.scala:192)
    at scala.collection.GenSeqLike$class.isDefinedAt(GenSeqLike.scala:72)
    at scala.collection.mutable.ArrayOps$ofRef.isDefinedAt(ArrayOps.scala:186)
    at mrtjp.core.inventory.TInventory$$anonfun$loadInv$1.apply$mcVI$sp(invtraits.scala:89)
    at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:160)
    at mrtjp.core.inventory.TInventory$class.loadInv(invtraits.scala:84)
    at mrtjp.projectred.exploration.BagInventory.loadInv(items.scala:114)
    at mrtjp.core.inventory.TInventory$class.loadInv(invtraits.scala:80)
    at mrtjp.projectred.exploration.BagInventory.loadInv(items.scala:114)
    at mrtjp.projectred.exploration.BagInventory.loadInventory(items.scala:125)
    at mrtjp.projectred.exploration.BagInventory.<init>(items.scala:116)
    at mrtjp.projectred.exploration.ItemBackpack$.createContainer(items.scala:77)
    at mrtjp.projectred.exploration.ItemBackpack.openGui(items.scala:54)
    at mrtjp.projectred.exploration.ItemBackpack.func_180614_a(items.scala:42)
    at net.minecraft.item.ItemStack.func_179546_a(ItemStack.java:146)
        ...

Core version: MrTJPCore-1.10.2-2.0.1.20 ProjectRed version: ProjectRed-1.10.2-4.8.4.49

• Crash report in my modpack: pastebin
• Crash with only MrTJPCore + ProjectRed: pastebin

[MrTJP]

Update.

[DeliciousJaffa]

I'm also having this issue and the versions listed are the latest available.