diff --git a/node_modules/expo-modules-core/android/src/main/java/expo/modules/kotlin/jni/JNIDeallocator.kt b/node_modules/expo-modules-core/android/src/main/java/expo/modules/kotlin/jni/JNIDeallocator.kt
--- a/node_modules/expo-modules-core/android/src/main/java/expo/modules/kotlin/jni/JNIDeallocator.kt
+++ b/node_modules/expo-modules-core/android/src/main/java/expo/modules/kotlin/jni/JNIDeallocator.kt
@@ -34,7 +34,10 @@ class JNIDeallocator(shouldCreateDestructorThread: Boolean = true) : AutoCloseab
             // Referent of PhantomReference were garbage collected so we can remove it from our registry.
             // Note that we don't have to call `deallocate` method - it was called [com.facebook.jni.HybridData].
             val current = referenceQueue.remove()
-            synchronized(this) {
+            // Goon: `this` w `object : Thread` to watek, nie deallocator. Blokada na watku
+            // nic nie chronila i remove szedl rownolegle z iteracja w deallocate(), stad
+            // ConcurrentModificationException przy przeladowaniu JS (Sentry GOON-48).
+            synchronized(this@JNIDeallocator) {
               destructorMap.remove(current)
             }
           } catch (e: InterruptedException) {
@@ -65,10 +68,13 @@ class JNIDeallocator(shouldCreateDestructorThread: Boolean = true) : AutoCloseab
    * Deallocates valid references and clears the internal registry.
    */
   internal fun deallocate() = synchronized(this) {
-    destructorMap.values.forEach {
+    // Goon: kopia przed wolaniem deallocate(), ktore moze wrocic do tej mapy z tego
+    // samego watku (blokada jest reentrant, wiec by nie zatrzymala), GOON-48.
+    val refs = destructorMap.values.toList()
+    destructorMap.clear()
+    refs.forEach {
       it.get()?.deallocate()
     }
-    destructorMap.clear()
     destructorThread?.interrupt()
   }