Game Crashes when Capuchin monkeys throw items

[beedrillz]

Recently, my game keeps crashing whenever the capuchins throw objects. I tried downloading a slightly older version of the mod but the problem was still there.
crash report as follows:

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

-- Head --
Thread: Server thread
Stacktrace:
at knot//com.github.alexthe666.alexsmobs.entity.EntityTossedItem.isDart(EntityTossedItem.java:48)
at knot//com.github.alexthe666.alexsmobs.entity.EntityTossedItem.method_16942(EntityTossedItem.java:130)
at knot//net.minecraft.class_3857.method_5693(class_3857.java:42)
at knot//com.github.alexthe666.alexsmobs.entity.EntityTossedItem.method_5693(EntityTossedItem.java:43)
at knot//net.minecraft.class_1297.(class_1297.java:309)
at knot//net.minecraft.class_1676.(class_1676.java:49)
at knot//net.minecraft.class_1682.(class_1682.java:12)
at knot//net.minecraft.class_1682.(class_1682.java:16)
at knot//net.minecraft.class_1682.(class_1682.java:22)
at knot//net.minecraft.class_3857.(class_3857.java:26)
at knot//com.github.alexthe666.alexsmobs.entity.EntityTossedItem.(EntityTossedItem.java:34)
at knot//com.github.alexthe666.alexsmobs.entity.EntityCapuchinMonkey.method_5773(EntityCapuchinMonkey.java:249)
at knot//net.minecraft.class_3218.mixinextras$bridge$method_5773$240(class_3218.java)
at knot//net.minecraft.class_3218.wrapOperation$enn001$porting_lib_entity$preEntityTick(class_3218.java:12306)
at knot//net.minecraft.class_3218.method_18762(class_3218.java:770)
at knot//net.minecraft.class_1937.method_18472(class_1937.java:498)
at knot//net.minecraft.class_3218.method_31420(class_3218.java:408)
at knot//net.minecraft.class_5574.method_31791(class_5574.java:54)

-- Entity being ticked --
Details:
Entity Type: alexsmobs:capuchin_monkey (com.github.alexthe666.alexsmobs.entity.EntityCapuchinMonkey)
Entity ID: 243
Entity Name: Capuchin Monkey
Entity's Exact location: 486.51, 67.00, 725.54
Entity's Block location: World: (486,67,725), Section: (at 6,3,5 in 30,4,45; chunk contains blocks 480,-64,720 to 495,319,735), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,-64,512 to 511,319,1023)
Entity's Momentum: 0.09, -0.08, 0.03
Entity's Passengers: []
Entity's Vehicle: null
Stacktrace:
at knot//net.minecraft.class_1937.method_18472(class_1937.java:498)
at knot//net.minecraft.class_3218.method_31420(class_3218.java:408)
at knot//net.minecraft.class_5574.method_31791(class_5574.java:54)
at knot//net.minecraft.class_3218.method_18765(class_3218.java:372)
at knot//net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:1021)
at knot//net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:912)
at knot//net.minecraft.class_1132.method_3748(class_1132.java:114)
at knot//net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:697)
at knot//net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:281)
at java.base/java.lang.Thread.run(Thread.java:1583)