diff --git a/dist/utils/maskSemanticPalette.d.ts.map b/dist/utils/maskSemanticPalette.d.ts.map
index f0a14d6..c0857b5 100644
--- a/dist/utils/maskSemanticPalette.d.ts.map
+++ b/dist/utils/maskSemanticPalette.d.ts.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"maskSemanticPalette.d.ts","sourceRoot":"","sources":["../../src/utils/maskSemanticPalette.ts"],"names":[],"mappings":"AAKA,MAAM,MAAM,iBAAiB,GAAG;IAC9B,IAAI,EAAE,MAAM,CAAC;IACb,GAAG,EAAE,MAAM,CAAC;IACZ,+BAA+B;IAC/B,GAAG,EAAE;QAAE,CAAC,EAAE,MAAM,CAAC;QAAC,CAAC,EAAE,MAAM,CAAC;QAAC,CAAC,EAAE,MAAM,CAAA;KAAE,CAAC;CAC1C,CAAC;AAEF,0BAA0B;AAC1B,eAAO,MAAM,oBAAoB,EAAE,iBAAiB,EAUnD,CAAC;AAEF,eAAO,MAAM,uBAAuB,cAAc,CAAC;AA8EnD,wCAAwC;AACxC,wBAAgB,0BAA0B,CACxC,CAAC,EAAE,MAAM,EACT,CAAC,EAAE,MAAM,EACT,CAAC,EAAE,MAAM,GACR,MAAM,CA8BR;AAED,wBAAgB,sBAAsB,CAAC,IAAI,EAAE,MAAM,GAAG,iBAAiB,GAAG,SAAS,CAGlF;AAED;;GAEG;AACH,wBAAgB,sBAAsB,CACpC,CAAC,EAAE,MAAM,EACT,CAAC,EAAE,MAAM,EACT,CAAC,EAAE,MAAM,GACR,OAAO,CAYT;AAED,wBAAgB,gBAAgB,CAAC,CAAC,EAAE,MAAM,EAAE,CAAC,EAAE,MAAM,EAAE,CAAC,EAAE,MAAM,GAAG,OAAO,CAEzE;AAED,qBAAqB;AACrB,eAAO,MAAM,0BAA0B,aAAuC,CAAC;AAE/E,eAAe;AACf,eAAO,MAAM,eAAe,aAM1B,CAAC;AAEH,iBAAiB;AACjB,eAAO,MAAM,kBAAkB,aAI7B,CAAC;AAEH,wBAAgB,0BAA0B,IAAI,GAAG,CAAC,MAAM,CAAC,CAExD;AAED,wBAAgB,gBAAgB,IAAI,GAAG,CAAC,MAAM,CAAC,CAE9C;AAED,wBAAgB,mBAAmB,IAAI,GAAG,CAAC,MAAM,CAAC,CAEjD"}
\ No newline at end of file
diff --git a/dist/utils/maskSemanticPalette.js b/dist/utils/maskSemanticPalette.js
index 34c183a..eedd912 100644
--- a/dist/utils/maskSemanticPalette.js
+++ b/dist/utils/maskSemanticPalette.js
@@ -24,6 +24,13 @@ function buildSemanticRgb(colors) {
         },
     }));
 }
+function getDefaultSemanticEntry(name) {
+    const color = MASK_SEMANTIC_COLORS.find(c => c.name === name);
+    return {
+        name: color.name,
+        rgb: { r: color.bgr.r, g: color.bgr.g, b: color.bgr.b },
+    };
+}
 function getSemanticContext() {
     const revision = getMaskRuntimeRevision();
     if (contextRevision === revision && cachedContext) {
@@ -31,9 +38,11 @@ function getSemanticContext() {
     }
     const mask = getMaskSegmentRuntimeConfig().mask;
     const semanticRgb = buildSemanticRgb(mask.semanticColors);
-    const baseboardRgb = semanticRgb.find(entry => entry.name === BASEBOARD_SEMANTIC_NAME);
-    const cabinetRgb = semanticRgb.find(entry => entry.name === 'cabinet');
-    const wallRgb = semanticRgb.find(entry => entry.name === 'wall');
+    const baseboardRgb = semanticRgb.find(entry => entry.name === BASEBOARD_SEMANTIC_NAME) ?? getDefaultSemanticEntry(BASEBOARD_SEMANTIC_NAME);
+    const cabinetRgb = semanticRgb.find(entry => entry.name === 'cabinet') ??
+        getDefaultSemanticEntry('cabinet');
+    const wallRgb = semanticRgb.find(entry => entry.name === 'wall') ??
+        getDefaultSemanticEntry('wall');
     const maxDist = mask.baseboardMaxColorDist;
     cachedContext = {
         baseboardMaxColorDistSq: maxDist * maxDist,
@@ -75,7 +84,7 @@ export function classifyBgrPixelToSemantic(b, g, r) {
             best = entry;
         }
     }
-    return best.name;
+    return best?.name ?? 'wall';
 }
 export function getSemanticColorByName(name) {
     const colors = getMaskSegmentRuntimeConfig().mask.semanticColors;
diff --git a/dist/utils/maskSemanticPalette.js.map b/dist/utils/maskSemanticPalette.js.map
index 9cb89cc..7733fd6 100644
--- a/dist/utils/maskSemanticPalette.js.map
+++ b/dist/utils/maskSemanticPalette.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/utils/maskSemanticPalette.ts b/src/utils/maskSemanticPalette.ts
index 22b8149..bb72b11 100644
--- a/src/utils/maskSemanticPalette.ts
+++ b/src/utils/maskSemanticPalette.ts
@@ -52,6 +52,14 @@ function buildSemanticRgb(colors: MaskSemanticColor[]): SemanticRgbEntry[] {
   }));
 }
 
+function getDefaultSemanticEntry(name: string): SemanticRgbEntry {
+  const color = MASK_SEMANTIC_COLORS.find(c => c.name === name)!;
+  return {
+    name: color.name,
+    rgb: { r: color.bgr.r, g: color.bgr.g, b: color.bgr.b },
+  };
+}
+
 function getSemanticContext(): SemanticContext {
   const revision = getMaskRuntimeRevision();
   if (contextRevision === revision && cachedContext) {
@@ -60,11 +68,16 @@ function getSemanticContext(): SemanticContext {
 
   const mask = getMaskSegmentRuntimeConfig().mask;
   const semanticRgb = buildSemanticRgb(mask.semanticColors);
-  const baseboardRgb = semanticRgb.find(
-    entry => entry.name === BASEBOARD_SEMANTIC_NAME,
-  )!;
-  const cabinetRgb = semanticRgb.find(entry => entry.name === 'cabinet')!;
-  const wallRgb = semanticRgb.find(entry => entry.name === 'wall')!;
+  const baseboardRgb =
+    semanticRgb.find(
+      entry => entry.name === BASEBOARD_SEMANTIC_NAME,
+    ) ?? getDefaultSemanticEntry(BASEBOARD_SEMANTIC_NAME);
+  const cabinetRgb =
+    semanticRgb.find(entry => entry.name === 'cabinet') ??
+    getDefaultSemanticEntry('cabinet');
+  const wallRgb =
+    semanticRgb.find(entry => entry.name === 'wall') ??
+    getDefaultSemanticEntry('wall');
   const maxDist = mask.baseboardMaxColorDist;
 
   cachedContext = {
@@ -122,7 +135,7 @@ export function classifyBgrPixelToSemantic(
     }
   }
 
-  return best.name;
+  return best?.name ?? 'wall';
 }
 
 export function getSemanticColorByName(name: string): MaskSemanticColor | undefined {