diff --git a/compiler/src/prog8/compiler/Compiler.kt b/compiler/src/prog8/compiler/Compiler.kt
index 6891e2c26..9c7a496e3 100644
--- a/compiler/src/prog8/compiler/Compiler.kt
+++ b/compiler/src/prog8/compiler/Compiler.kt
@@ -335,12 +335,18 @@ private fun writeAssembly(programAst: Program,
             compilerOptions.compTarget.machine.zeropage,
             compilerOptions,
             outputDir).compileToAssembly()
-    val assemblerReturnStatus = assembly.assemble(compilerOptions)
-    return if(assemblerReturnStatus!=0)
-        Pair(false, "assembler step failed with return code $assemblerReturnStatus")
-    else {
+
+    return if(assembly.valid && errors.noErrors()) {
+        val assemblerReturnStatus = assembly.assemble(compilerOptions)
+        if(assemblerReturnStatus!=0)
+            Pair(false, "assembler step failed with return code $assemblerReturnStatus")
+        else {
+            errors.report()
+            Pair(true, assembly.name)
+        }
+    } else {
         errors.report()
-        Pair(true, assembly.name)
+        Pair(false, "compiler failed with errors")
     }
 }
 
diff --git a/compiler/src/prog8/compiler/target/IAssemblyGenerator.kt b/compiler/src/prog8/compiler/target/IAssemblyGenerator.kt
index 0b01f492a..d184d05ca 100644
--- a/compiler/src/prog8/compiler/target/IAssemblyGenerator.kt
+++ b/compiler/src/prog8/compiler/target/IAssemblyGenerator.kt
@@ -11,6 +11,7 @@ internal const val subroutineFloatEvalResultVar1 = "_prog8_float_eval_result1"
 internal const val subroutineFloatEvalResultVar2 = "_prog8_float_eval_result2"
 
 internal interface IAssemblyProgram {
+    val valid: Boolean
     val name: String
     fun assemble(options: CompilationOptions): Int
 }
diff --git a/compiler/src/prog8/compiler/target/cbm/AssemblyProgram.kt b/compiler/src/prog8/compiler/target/cbm/AssemblyProgram.kt
index db79dcbf0..30bba8159 100644
--- a/compiler/src/prog8/compiler/target/cbm/AssemblyProgram.kt
+++ b/compiler/src/prog8/compiler/target/cbm/AssemblyProgram.kt
@@ -9,7 +9,12 @@ import java.nio.file.Path
 
 internal const val viceMonListPostfix = "vice-mon-list"
 
-class AssemblyProgram(override val name: String, outputDir: Path, private val compTarget: String) : IAssemblyProgram {
+class AssemblyProgram(
+        override val valid: Boolean,
+        override val name: String,
+        outputDir: Path,
+        private val compTarget: String) : IAssemblyProgram {
+
     private val assemblyFile = outputDir.resolve("$name.asm")
     private val prgFile = outputDir.resolve("$name.prg")
     private val binFile = outputDir.resolve("$name.bin")
diff --git a/compiler/src/prog8/compiler/target/cpu6502/codegen/AsmGen.kt b/compiler/src/prog8/compiler/target/cpu6502/codegen/AsmGen.kt
index 8c55cedc1..17059c877 100644
--- a/compiler/src/prog8/compiler/target/cpu6502/codegen/AsmGen.kt
+++ b/compiler/src/prog8/compiler/target/cpu6502/codegen/AsmGen.kt
@@ -87,7 +87,11 @@ internal class AsmGen(private val program: Program,
             }
         }
 
-        return AssemblyProgram(program.name, outputDir, compTarget.name)
+        return if(errors.noErrors())
+            AssemblyProgram(true, program.name, outputDir, compTarget.name)
+        else {
+            AssemblyProgram(false, "<error>", outputDir, compTarget.name)
+        }
     }
 
     internal fun isTargetCpu(cpu: CpuType) = compTarget.machine.cpu == cpu
@@ -1317,8 +1321,10 @@ $repeatLabel    lda  $counterVar
                 // TODO: handle %asminclude with SourceCode
                 val includedName = stmt.args[0].str!!
                 val sourcePath = Path(stmt.definingModule.source!!.pathString()) // FIXME: %asminclude inside non-library, non-filesystem module
-                val sourcecode = loadAsmIncludeFile(includedName, sourcePath).getOrThrow()
-                assemblyLines.add(sourcecode.trimEnd().trimStart('\n'))
+                loadAsmIncludeFile(includedName, sourcePath).fold(
+                    onSuccess = { assemblyLines.add(it.trimEnd().trimStart('\n')) },
+                    onFailure = { errors.err(it.toString(), stmt.position) }
+                )
             }
             "%asmbinary" -> {
                 val includedName = stmt.args[0].str!!