diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/FirTypeUtils.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/FirTypeUtils.kt
index d3f114085c1..d0f4e6af615 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/FirTypeUtils.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/types/FirTypeUtils.kt
@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.fir.types
 
 import org.jetbrains.kotlin.fir.expressions.FirAnnotationCall
 import org.jetbrains.kotlin.fir.expressions.FirConstKind
+import org.jetbrains.kotlin.fir.render
 import org.jetbrains.kotlin.fir.symbols.StandardClassIds
 import org.jetbrains.kotlin.fir.types.impl.FirImplicitBuiltinTypeRef
 import org.jetbrains.kotlin.name.ClassId
@@ -23,7 +24,9 @@ inline fun <reified T : ConeKotlinType> FirTypeRef.coneTypeSafe(): T? {
     return (this as? FirResolvedTypeRef)?.type as? T
 }
 
-inline val FirTypeRef.coneType: ConeKotlinType get() = coneTypeUnsafe()
+inline val FirTypeRef.coneType: ConeKotlinType
+    get() = coneTypeSafe()
+        ?: error("Expected FirResolvedTypeRef with ConeKotlinType but was ${this::class.simpleName} ${render()}")
 
 val FirTypeRef.isAny: Boolean get() = isBuiltinType(StandardClassIds.Any, false)
 val FirTypeRef.isNullableAny: Boolean get() = isBuiltinType(StandardClassIds.Any, true)