diff --git a/core/src/main/java/org/teavm/common/IrreducibleGraphConverter.java b/core/src/main/java/org/teavm/common/IrreducibleGraphConverter.java
index 17cd3fe83..fb043184b 100644
--- a/core/src/main/java/org/teavm/common/IrreducibleGraphConverter.java
+++ b/core/src/main/java/org/teavm/common/IrreducibleGraphConverter.java
@@ -35,7 +35,7 @@ class IrreducibleGraphConverter {
     private IntSet[] nodeCopies;
     private IntegerArray nodeOriginals;
 
-    public void convertToReducible(Graph cfg, int[] weight, GraphSplittingBackend backend) {
+    void convertToReducible(Graph cfg, int[] weight, GraphSplittingBackend backend) {
         this.backend = backend;
 
         nodeCopies = new IntOpenHashSet[cfg.size()];
diff --git a/core/src/main/java/org/teavm/model/util/AsyncProgramSplitter.java b/core/src/main/java/org/teavm/model/util/AsyncProgramSplitter.java
index ea6e47622..ac6971df7 100644
--- a/core/src/main/java/org/teavm/model/util/AsyncProgramSplitter.java
+++ b/core/src/main/java/org/teavm/model/util/AsyncProgramSplitter.java
@@ -164,12 +164,16 @@ public class AsyncProgramSplitter {
         }
 
         for (Part part : parts) {
+            Graph graph = ProgramUtils.buildControlFlowGraph(part.program);
+            if (!GraphUtils.isIrreducible(graph)) {
+                continue;
+            }
+
             IntegerArray blockSuccessors = IntegerArray.of(part.blockSuccessors);
             IntegerArray originalBlocks = IntegerArray.of(part.originalBlocks);
             List<Instruction> splitPoints = new ArrayList<>(Arrays.asList(part.splitPoints));
             AsyncProgramSplittingBackend splittingBackend = new AsyncProgramSplittingBackend(
                     new ProgramNodeSplittingBackend(part.program), blockSuccessors, originalBlocks, splitPoints);
-            Graph graph = ProgramUtils.buildControlFlowGraph(part.program);
             int[] weights = new int[graph.size()];
             for (int i = 0; i < part.program.basicBlockCount(); ++i) {
                 weights[i] = part.program.basicBlockAt(i).instructionCount();
@@ -278,7 +282,7 @@ public class AsyncProgramSplitter {
         private IntegerArray originalBlocks;
         private List<Instruction> splitPoints;
 
-        public AsyncProgramSplittingBackend(GraphSplittingBackend inner, IntegerArray blockSuccessors,
+        AsyncProgramSplittingBackend(GraphSplittingBackend inner, IntegerArray blockSuccessors,
                 IntegerArray originalBlocks, List<Instruction> splitPoints) {
             this.inner = inner;
             this.blockSuccessors = blockSuccessors;
diff --git a/core/src/main/java/org/teavm/model/util/BasicBlockMapper.java b/core/src/main/java/org/teavm/model/util/BasicBlockMapper.java
index 1216d8c75..c2b92591e 100644
--- a/core/src/main/java/org/teavm/model/util/BasicBlockMapper.java
+++ b/core/src/main/java/org/teavm/model/util/BasicBlockMapper.java
@@ -43,10 +43,9 @@ public class BasicBlockMapper extends AbstractInstructionVisitor {
 
     public void transform(BasicBlock block) {
         Instruction lastInsn = block.getLastInstruction();
-        if (lastInsn == null) {
-            return;
+        if (lastInsn != null) {
+            lastInsn.acceptVisitor(this);
         }
-        lastInsn.acceptVisitor(this);
 
         for (Phi phi : block.getPhis()) {
             for (Incoming incoming : phi.getIncomings()) {
diff --git a/core/src/main/java/org/teavm/model/util/ProgramNodeSplittingBackend.java b/core/src/main/java/org/teavm/model/util/ProgramNodeSplittingBackend.java
index e281a61fe..8939fc9c5 100644
--- a/core/src/main/java/org/teavm/model/util/ProgramNodeSplittingBackend.java
+++ b/core/src/main/java/org/teavm/model/util/ProgramNodeSplittingBackend.java
@@ -37,6 +37,7 @@ public class ProgramNodeSplittingBackend implements GraphSplittingBackend {
             BasicBlock block = program.basicBlockAt(node);
             BasicBlock blockCopy = program.createBasicBlock();
             blockCopy.addAll(ProgramUtils.copyInstructions(block.getFirstInstruction(), null, program));
+            blockCopy.getTryCatchBlocks().addAll(ProgramUtils.copyTryCatches(block, program));
             copies[i] = blockCopy.getIndex();
             map.put(nodes[i], copies[i] + 1);
         }
diff --git a/tools/idea/jps-common/teavm-jps-common.iml b/tools/idea/jps-common/teavm-jps-common.iml
index f8f512fdd..c5cba2620 100644
--- a/tools/idea/jps-common/teavm-jps-common.iml
+++ b/tools/idea/jps-common/teavm-jps-common.iml
@@ -17,6 +17,7 @@
         <JAVADOC />
         <SOURCES>
           <root url="file://$MODULE_DIR$/../../core/src/main/java" />
+          <root url="file://$MODULE_DIR$/../../../core/src/main/java" />
         </SOURCES>
       </library>
     </orderEntry>