To reproduce:

1) open Minecraft PE (preferably on a slower device, like the Nexus 7 (2012))
2) immediately after the title screen shows up, press the Multitask button to put Minecraft PE into the background
3) tap on Minecraft PE to bring it back to the foreground

Expected result: MCPE goes back into the foreground

Actual result: MCPE crashes as it tries to access a TextureAtlas that isn't loaded in MinecraftClient::onAppResume

F/libc ( 4941): Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 4959 (Thread-237)
I/DEBUG ( 139): request->uid:10057 > property debug.db.uid:0; NOT waiting for gdb.
I/DEBUG ( 139): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG ( 139): Build fingerprint: 'google/nakasi/grouper:5.1/LMY47D/1743759:user/release-keys'
I/DEBUG ( 139): Revision: '0'
I/DEBUG ( 139): ABI: 'arm'
I/DEBUG ( 139): pid: 4941, tid: 4959, name: Thread-237 >>> com.mojang.minecraftpe <<<
I/DEBUG ( 139): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
I/DEBUG ( 139): r0 00000000 r1 00004000 r2 00000000 r3 00000000
I/DEBUG ( 139): r4 5f43dc60 r5 00000000 r6 5f441a2c r7 6c237d34
I/DEBUG ( 139): r8 7023adc0 r9 6c128428 sl 7bfe0c48 fp 6c12855c
I/DEBUG ( 139): ip 00000001 sp 6c237c20 lr 00000000 pc 6ac2f0c8 cpsr 600b0030
I/DEBUG ( 139):
I/DEBUG ( 139): backtrace:
I/DEBUG ( 139): #00 pc 007a60c8 /data/app/com.mojang.minecraftpe-1/lib/arm/libminecraftpe.so (_ZN15MinecraftClient12onAppResumedEv+159)
I/DEBUG ( 139): #01 pc 00d742df /data/app/com.mojang.minecraftpe-1/lib/arm/libminecraftpe.so (_ZN11AppPlatform15_fireAppResumedEv+26)
I/DEBUG ( 139): #02 pc 0118dce3 /data/app/com.mojang.minecraftpe-1/lib/arm/libminecraftpe.so (_Z17engine_handle_cmdP11android_appi+466)
I/DEBUG ( 139): #03 pc 01193553 /data/app/com.mojang.minecraftpe-1/lib/arm/libminecraftpe.so
I/DEBUG ( 139): #04 pc 0118d74d /data/app/com.mojang.minecraftpe-1/lib/arm/libminecraftpe.so (android_main+732)
I/DEBUG ( 139): #05 pc 01193499 /data/app/com.mojang.minecraftpe-1/lib/arm/libminecraftpe.so
I/DEBUG ( 139): #06 pc 0001354b /system/lib/libc.so (ZL15_pthread_startPv+30)
I/DEBUG ( 139): #07 pc 00011477 /system/lib/libc.so (__start_thread+6)