diff --git a/experiments/translator/src/main/kotlin/org/kotlinnative/translator/codegens/BlockCodegen.kt b/experiments/translator/src/main/kotlin/org/kotlinnative/translator/codegens/BlockCodegen.kt
index 4335671dc56..be04b431c66 100644
--- a/experiments/translator/src/main/kotlin/org/kotlinnative/translator/codegens/BlockCodegen.kt
+++ b/experiments/translator/src/main/kotlin/org/kotlinnative/translator/codegens/BlockCodegen.kt
@@ -21,6 +21,8 @@ import org.kotlinnative.translator.TranslationState
 import org.kotlinnative.translator.VariableManager
 import org.kotlinnative.translator.llvm.*
 import org.kotlinnative.translator.llvm.types.*
+import java.lang.RuntimeException
+import java.lang.UnsupportedOperationException
 import java.rmi.UnexpectedException
 import kotlin.comparisons.compareBy
 
@@ -1095,7 +1097,7 @@ abstract class BlockCodegen(val state: TranslationState,
                     is LLVMVariable -> LLVMVariable(retVar.label, LLVMNullType(returnType!!.type), retVar.kotlinName, retVar.scope, returnType!!.pointer - 1)
                     else -> throw UnexpectedException("Unknown inheritor of LLVMSingleValue")
                 }
-                generateReferenceReturn(retVar)
+                generateReferenceReturn(retVar!!)
             }
             is LLVMVoidType -> codeBuilder.addAnyReturn(LLVMVoidType())
             else -> {
diff --git a/experiments/translator/src/main/kotlin/org/kotlinnative/translator/exceptions/TranslationException.kt b/experiments/translator/src/main/kotlin/org/kotlinnative/translator/exceptions/TranslationException.kt
index 7f284f7d29a..4b132fcbbcc 100644
--- a/experiments/translator/src/main/kotlin/org/kotlinnative/translator/exceptions/TranslationException.kt
+++ b/experiments/translator/src/main/kotlin/org/kotlinnative/translator/exceptions/TranslationException.kt
@@ -1,3 +1,5 @@
 package org.kotlinnative.translator.exceptions
 
+import java.lang.Exception
+
 class TranslationException(message: String) : Exception(message)
diff --git a/experiments/translator/src/main/kotlin/org/kotlinnative/translator/exceptions/UnimplementedException.kt b/experiments/translator/src/main/kotlin/org/kotlinnative/translator/exceptions/UnimplementedException.kt
index 0906653fcd6..e4b2b0dd4bc 100644
--- a/experiments/translator/src/main/kotlin/org/kotlinnative/translator/exceptions/UnimplementedException.kt
+++ b/experiments/translator/src/main/kotlin/org/kotlinnative/translator/exceptions/UnimplementedException.kt
@@ -1,3 +1,5 @@
 package org.kotlinnative.translator.exceptions
 
+import java.lang.Exception
+
 class UnimplementedException() : Exception()
diff --git a/experiments/translator/src/main/kotlin/org/kotlinnative/translator/llvm/types/LLVMBooleanType.kt b/experiments/translator/src/main/kotlin/org/kotlinnative/translator/llvm/types/LLVMBooleanType.kt
index 0b58f1dd43f..856a030be72 100644
--- a/experiments/translator/src/main/kotlin/org/kotlinnative/translator/llvm/types/LLVMBooleanType.kt
+++ b/experiments/translator/src/main/kotlin/org/kotlinnative/translator/llvm/types/LLVMBooleanType.kt
@@ -2,6 +2,7 @@ package org.kotlinnative.translator.llvm.types
 
 import org.kotlinnative.translator.llvm.LLVMExpression
 import org.kotlinnative.translator.llvm.LLVMSingleValue
+import java.lang.IllegalArgumentException
 
 
 class LLVMBooleanType() : LLVMType() {