Bug with fishing rod and NoGravity tag

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Please attach the crash report.

Minecraft Crash Report ----
// Why did you do that?

Time: 25/05/16 17:55
Description: Executing command block

java.lang.NullPointerException: Executing command block
at rx.a(SourceFile:324)
at p$1.a(SourceFile:188)
at p$1.apply(SourceFile:185)
at com.google.common.base.Predicates$AndPredicate.apply(Predicates.java:359)
at com.google.common.base.Predicates$AndPredicate.apply(Predicates.java:359)
at aic.a(SourceFile:2283)
at p.a(SourceFile:490)
at p.b(SourceFile:143)
at k.a(SourceFile:51)
at ahr.a(SourceFile:114)
at akw.b(SourceFile:96)
at lr.a(SourceFile:645)
at lr.d(SourceFile:216)
at net.minecraft.server.MinecraftServer.D(SourceFile:618)
at net.minecraft.server.MinecraftServer.C(SourceFile:554)
at bzk.C(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Thread: Server thread
Stacktrace:
at rx.a(SourceFile:324)
at p$1.a(SourceFile:188)
at p$1.apply(SourceFile:185)
at com.google.common.base.Predicates$AndPredicate.apply(Predicates.java:359)
at com.google.common.base.Predicates$AndPredicate.apply(Predicates.java:359)
at aic.a(SourceFile:2283)
at p.a(SourceFile:490)
at p.b(SourceFile:143)
at k.a(SourceFile:51)

– Command to be executed –
Details:
Command: entitydata @e[type=!Player] {NoGravity:1b}
Name: @
Stacktrace:
at ahr.a(SourceFile:114)
at akw.b(SourceFile:96)

– Block being ticked –
Details:
Block: minecraft:repeating_command_block[conditional=false,facing=up]
Block location: World: (152,72,642), Chunk: (at 8,4,2 in 9,40; contains blocks 144,0,640 to 159,255,655), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
Stacktrace:
at lr.a(SourceFile:645)
at lr.d(SourceFile:216)

– Affected level –
Details:
Level name: 1.10
All players: 1 total; [lt['BaDk23'/170, l='1.10', x=152,51, y=73,00, z=642,27]]
Chunk stats: ServerChunkCache: 370 Drop: 0
Level seed: 5089131294134677737
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (44,64,248), Chunk: (at 12,4,8 in 2,15; contains blocks 32,0,240 to 47,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 28021 game time, 7990 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 1 (now: false), thunder time: 1 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.D(SourceFile:618)
at net.minecraft.server.MinecraftServer.C(SourceFile:554)
at bzk.C(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:458)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 16w21a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 107445784 bytes (102 MB) / 290029568 bytes (276 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [lt['BaDk23'/170, l='1.10', x=152,51, y=73,00, z=642,27]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.