diff --git a/patches/src/main/kotlin/app/revanced/util/BytecodeUtils.kt b/patches/src/main/kotlin/app/revanced/util/BytecodeUtils.kt
index 1e711271c..d65a95eaa 100644
--- a/patches/src/main/kotlin/app/revanced/util/BytecodeUtils.kt
+++ b/patches/src/main/kotlin/app/revanced/util/BytecodeUtils.kt
@@ -504,7 +504,7 @@ fun Method.indexOfFirstInstruction(startIndex: Int = 0, targetOpcode: Opcode): I
  * @see indexOfFirstInstructionOrThrow
  */
 fun Method.indexOfFirstInstruction(startIndex: Int = 0, filter: Instruction.() -> Boolean): Int {
-    var instructions = this.implementation!!.instructions
+    var instructions = this.implementation?.instructions ?: return -1
     if (startIndex != 0) {
         instructions = instructions.drop(startIndex)
     }
@@ -570,7 +570,7 @@ fun Method.indexOfFirstInstructionReversed(startIndex: Int? = null, targetOpcode
  * @see indexOfFirstInstructionReversedOrThrow
  */
 fun Method.indexOfFirstInstructionReversed(startIndex: Int? = null, filter: Instruction.() -> Boolean): Int {
-    var instructions = this.implementation!!.instructions
+    var instructions = this.implementation?.instructions ?: return -1
     if (startIndex != null) {
         instructions = instructions.take(startIndex + 1)
     }