fixed npe where lectern hasn't been selected

gradle.properties

@@ -6,7 +6,7 @@ minecraft_version=1.19.2
 yarn_mappings=1.19.2+build.28
 loader_version=0.14.17
 # Mod Properties
-mod_version=1.2
+mod_version=1.2-1.19.2
 maven_group=de.gamedude
 archives_base_name=EasyVillagerTrade
 # Dependencies

src/main/java/de/gamedude/easyvillagertrade/core/EasyVillagerTradeBase.java

@@ -99,6 +99,7 @@ private void handlePlacement() {
     private void handleBreak() {
         World world = minecraftClient.world;
         ClientPlayerEntity player = minecraftClient.player;
+        BlockPos blockPos = getSelectionInterface().getLecternPos();
 
         if (world == null || player == null)
             return;
@@ -108,6 +109,13 @@ private void handleBreak() {
             setState(TradingState.INACTIVE);
             return;
         }
+
+        if(blockPos == null) {
+            player.sendMessage(Text.translatable("evt.logic.pos_not_set"));
+            setState(TradingState.INACTIVE);
+            return;
+        }
+
         if (world.getBlockState(getSelectionInterface().getLecternPos()).getBlock() == Blocks.LECTERN) {
             minecraftClient.interactionManager.updateBlockBreakingProgress(getSelectionInterface().getLecternPos(), Direction.UP);
             player.swingHand(Hand.MAIN_HAND, true);

src/main/resources/assets/easyvillagertrade/lang/en_us.json

@@ -15,6 +15,7 @@
   "evt.logic.select.fail_lectern": "§8| §cUnable to find any lecterns close to you.",
   "evt.logic.select.fail_villager": "§8| §cNo appropriate villager near the lectern was found.",
   "evt.logic.select.success": "§8| §aThe closest villager and lectern were selected.",
+  "evt.logic.pos_not_set": "§8| §cYou haven't selected the lectern yet!",
 
   "key.custom.openscreen": "Open screen"
 }