- #11, untested.

build.gradle.kts

@@ -12,7 +12,7 @@ plugins {
 
 // Project properties
 group = "github.kasuminova.stellarcore"
-version = "1.4.9"
+version = "1.4.10"
 
 // Set the toolchain version to decouple the Java we run Gradle with from the Java used to compile and run the mod
 java {

src/main/java/github/kasuminova/stellarcore/common/config/StellarCoreConfig.java

@@ -488,6 +488,10 @@ public static class Techguns {
             @Config.Name("InvalidRecipeFixes")
             public boolean fixAmmoSumRecipeFactory = true;
 
+            @Config.Comment("Fixes an issue that would cause crashes in server environments.")
+            @Config.Name("ServerSideEntityCrashFixes")
+            public boolean serverSideEntityCrashFixes = true;
+
         }
 
         public static class TheOneProbe {

src/main/java/github/kasuminova/stellarcore/mixin/techguns/MixinBioGunProjectile.java

@@ -0,0 +1,36 @@
+package github.kasuminova.stellarcore.mixin.techguns;
+
+import github.kasuminova.stellarcore.common.config.StellarCoreConfig;
+import net.minecraft.entity.Entity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import techguns.client.ClientProxy;
+import techguns.entities.projectiles.BioGunProjectile;
+
+@Mixin(BioGunProjectile.class)
+@SuppressWarnings("MethodMayBeStatic")
+public abstract class MixinBioGunProjectile extends Entity {
+
+    @SuppressWarnings("DataFlowIssue")
+    public MixinBioGunProjectile() {
+        super(null);
+    }
+
+    @Redirect(method = "<init>(Lnet/minecraft/world/World;)V", at = @At(value = "INVOKE", target = "Ltechguns/client/ClientProxy;get()Ltechguns/client/ClientProxy;"))
+    private ClientProxy injectInitGetProxy() {
+        if (world.isRemote || !StellarCoreConfig.BUG_FIXES.techguns.serverSideEntityCrashFixes) {
+            return ClientProxy.get();
+        }
+        return null;
+    }
+
+    @Redirect(method = "<init>(Lnet/minecraft/world/World;)V", at = @At(value = "INVOKE", target = "Ltechguns/client/ClientProxy;createFXOnEntity(Ljava/lang/String;Lnet/minecraft/entity/Entity;)V"))
+    private void injectInitCreateFX(final ClientProxy instance, final String name, final Entity ent) {
+        if (instance != null || !StellarCoreConfig.BUG_FIXES.techguns.serverSideEntityCrashFixes) {
+            assert instance != null;
+            instance.createFXOnEntity(name, ent);
+        }
+    }
+
+}

src/main/java/github/kasuminova/stellarcore/mixin/techguns/MixinFlamethrowerProjectile.java

@@ -0,0 +1,36 @@
+package github.kasuminova.stellarcore.mixin.techguns;
+
+import github.kasuminova.stellarcore.common.config.StellarCoreConfig;
+import net.minecraft.entity.Entity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import techguns.client.ClientProxy;
+import techguns.entities.projectiles.FlamethrowerProjectile;
+
+@Mixin(FlamethrowerProjectile.class)
+@SuppressWarnings("MethodMayBeStatic")
+public abstract class MixinFlamethrowerProjectile extends Entity {
+
+    @SuppressWarnings("DataFlowIssue")
+    public MixinFlamethrowerProjectile() {
+        super(null);
+    }
+
+    @Redirect(method = "<init>(Lnet/minecraft/world/World;)V", at = @At(value = "INVOKE", target = "Ltechguns/client/ClientProxy;get()Ltechguns/client/ClientProxy;"))
+    private ClientProxy injectInitGetProxy() {
+        if (world.isRemote || !StellarCoreConfig.BUG_FIXES.techguns.serverSideEntityCrashFixes) {
+            return ClientProxy.get();
+        }
+        return null;
+    }
+
+    @Redirect(method = "<init>(Lnet/minecraft/world/World;)V", at = @At(value = "INVOKE", target = "Ltechguns/client/ClientProxy;createFXOnEntity(Ljava/lang/String;Lnet/minecraft/entity/Entity;)V"))
+    private void injectInitCreateFX(final ClientProxy instance, final String name, final Entity ent) {
+        if (instance != null || !StellarCoreConfig.BUG_FIXES.techguns.serverSideEntityCrashFixes) {
+            assert instance != null;
+            instance.createFXOnEntity(name, ent);
+        }
+    }
+
+}

src/main/resources/mixins.stellar_core_techguns.json

@@ -6,6 +6,8 @@
     "compatibilityLevel": "JAVA_8",
     "mixins": [
         "MixinAmmoSumRecipe",
+        "MixinBioGunProjectile",
+        "MixinFlamethrowerProjectile",
         "MixinTGDamageSource",
         "MixinTGExtendedPlayer",
         "MixinTGPermissions"