diff --git a/packages/cli/src/linter/model/color-parser.ts b/packages/cli/src/linter/model/color-parser.ts
index f1a5206..f7127e1 100644
--- a/packages/cli/src/linter/model/color-parser.ts
+++ b/packages/cli/src/linter/model/color-parser.ts
@@ -60,6 +60,7 @@ const CSS_NAMED_COLORS: Record<string, string> = {
  * Returns null if the color is invalid.
  */
 export function parseCssColor(colorStr: string): ParsedColorResult | null {
+  if (typeof colorStr !== 'string') return null;
   const clean = colorStr.trim().toLowerCase();
   if (!clean) return null;
 
diff --git a/packages/cli/src/linter/model/handler.ts b/packages/cli/src/linter/model/handler.ts
index caca7e4..8cfd71c 100644
--- a/packages/cli/src/linter/model/handler.ts
+++ b/packages/cli/src/linter/model/handler.ts
@@ -178,9 +178,10 @@ export class ModelHandler implements ModelSpec {
 
           for (const [propName, rawValue] of Object.entries(props)) {
             // Numeric values (e.g. fontWeight: 600, borderWidth: 1) are valid
-            // per spec and must be stored as-is, coercing to string first
-            // would cause isTokenReference / isValidColor to call .match() on
-            // a number and crash with "raw.match is not a function".
+            // per spec and must be stored as-is. We check for 'number' here,
+            // but isTokenReference, isValidColor, and isParseableDimension
+            // are also guarded against other non-string types (like booleans)
+            // to prevent crashes like "raw.match is not a function".
             if (typeof rawValue === 'number') {
               properties.set(propName, rawValue);
             } else if (isTokenReference(rawValue)) {
diff --git a/packages/cli/src/linter/model/spec.ts b/packages/cli/src/linter/model/spec.ts
index 0b390f6..915278f 100644
--- a/packages/cli/src/linter/model/spec.ts
+++ b/packages/cli/src/linter/model/spec.ts
@@ -142,6 +142,7 @@ const CSS_UNITS = new Set([
  * Returns null for non-dimension strings (bare numbers, keywords like `auto`).
  */
 export function parseDimensionParts(raw: string): { value: number; unit: string } | null {
+  if (typeof raw !== 'string') return null;
   const match = raw.match(/^(-?\d*\.?\d+)([a-zA-Z%]+)$/);
   if (!match) return null;
   const value = parseFloat(match[1]!);