diff --git a/Sources/EnumeratorMacroImpl/EnumeratorMacroType.swift b/Sources/EnumeratorMacroImpl/EnumeratorMacroType.swift
index 4e7233d..f8638ba 100644
--- a/Sources/EnumeratorMacroImpl/EnumeratorMacroType.swift
+++ b/Sources/EnumeratorMacroImpl/EnumeratorMacroType.swift
@@ -62,7 +62,7 @@ extension EnumeratorMacroType: MemberMacro {
                     )
                     let segments = Array(syntax.segments)
                     let segmentIdx = parserError.context.lineNumber - 2
-                    if segmentIdx < segments.count {
+                    if segmentIdx >= 0, segmentIdx < segments.count {
                         let syntaxAtErrorLine = segments[segmentIdx]
                         errorSyntax = syntaxAtErrorLine
                     } else {
@@ -88,7 +88,19 @@ extension EnumeratorMacroType: MemberMacro {
             let decls = SourceFileSyntax(
                 stringLiteral: rendered
             ).statements.compactMap { statement in
-                DeclSyntax(statement.item)
+                if let syntax = DeclSyntax(statement.item) {
+                    return syntax
+                } else {
+                    context.diagnose(
+                        Diagnostic(
+                            node: syntax,
+                            message: MacroError.internalError(
+                                "Could not convert an CodeBlockItemSyntax to a DeclSyntax"
+                            )
+                        )
+                    )
+                    return nil
+                }
             }
             if let withError = decls.first(where: \.hasError) {
                 context.diagnose(
diff --git a/Sources/EnumeratorMacroImpl/MacroError.swift b/Sources/EnumeratorMacroImpl/MacroError.swift
index c1f183b..a080b7d 100644
--- a/Sources/EnumeratorMacroImpl/MacroError.swift
+++ b/Sources/EnumeratorMacroImpl/MacroError.swift
@@ -10,6 +10,7 @@ enum MacroError: Error, CustomStringConvertible {
     case renderedSyntaxContainsErrors(String)
     case couldNotFindLocationOfNode(syntax: String)
     case mustacheTemplateError(message: String)
+    case internalError(String)
 
     var description: String {
         switch self {
@@ -29,6 +30,8 @@ enum MacroError: Error, CustomStringConvertible {
             "Could not find location of node for syntax:\n\(syntax)"
         case let .mustacheTemplateError(message):
             "Error while rendering the template: \(message)"
+        case let .internalError(message):
+            "An internal error occurred. Please file a bug report at https://github.com/mahdibm/enumerator-macro. Error:\n\(message)"
         }
     }
 }
diff --git a/Sources/EnumeratorMacroImpl/Types/EnumCase.swift b/Sources/EnumeratorMacroImpl/Types/EnumCase.swift
index 3ad97ef..9c620a3 100644
--- a/Sources/EnumeratorMacroImpl/Types/EnumCase.swift
+++ b/Sources/EnumeratorMacroImpl/Types/EnumCase.swift
@@ -17,4 +17,3 @@ struct EnumCase {
         })
     }
 }
-
diff --git a/Sources/EnumeratorMacroImpl/Types/Utils.swift b/Sources/EnumeratorMacroImpl/Types/Utils.swift
index 628d0ef..ff88cc1 100644
--- a/Sources/EnumeratorMacroImpl/Types/Utils.swift
+++ b/Sources/EnumeratorMacroImpl/Types/Utils.swift
@@ -65,8 +65,4 @@ extension Optional: OptionalProtocol {
     func asConvertedOptionalAny() -> Optional<Any> {
         self.map { convertToCustomTypesIfPossible($0) }
     }
-
-    func requireConvertedWrappedType() -> any Any.Type {
-        type(of: convertToCustomTypesIfPossible(self!))
-    }
 }