diff --git a/lib/trap-caching.js b/lib/trap-caching.js
index e4ec93ae2f..31b0205236 100644
--- a/lib/trap-caching.js
+++ b/lib/trap-caching.js
@@ -141,9 +141,16 @@ async function getLanguagesSupportingCaching(codeql, languages, logger) {
         return result;
     const resolveResult = await codeql.betterResolveLanguages();
     outer: for (const lang of languages) {
-        if (resolveResult.extractors[lang].length !== 1)
+        const extractorsForLanguage = resolveResult.extractors[lang];
+        if (extractorsForLanguage === undefined) {
+            logger.info(`${lang} does not support TRAP caching (couldn't find an extractor)`);
             continue;
-        const extractor = resolveResult.extractors[lang][0];
+        }
+        if (extractorsForLanguage.length !== 1) {
+            logger.info(`${lang} does not support TRAP caching (found multiple extractors)`);
+            continue;
+        }
+        const extractor = extractorsForLanguage[0];
         const trapCacheOptions = (_d = (_c = (_b = (_a = extractor.extractor_options) === null || _a === void 0 ? void 0 : _a.trap) === null || _b === void 0 ? void 0 : _b.properties) === null || _c === void 0 ? void 0 : _c.cache) === null || _d === void 0 ? void 0 : _d.properties;
         if (trapCacheOptions === undefined) {
             logger.info(`${lang} does not support TRAP caching (missing option group)`);
diff --git a/lib/trap-caching.js.map b/lib/trap-caching.js.map
index 24ac6c5112..5aeb514d2d 100644
--- a/lib/trap-caching.js.map
+++ b/lib/trap-caching.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"trap-caching.js","sourceRoot":"","sources":["../src/trap-caching.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;AAAA,uCAAyB;AACzB,2CAA6B;AAC7B,+BAAiC;AAEjC,sDAAwC;AACxC,sEAA4C;AAE5C,4DAA8C;AAC9C,qCAA2E;AAI3E,iCAA4C;AAE5C,8DAA8D;AAC9D,+DAA+D;AAC/D,6DAA6D;AAC7D,6DAA6D;AAC7D,2BAA2B;AAC3B,MAAM,aAAa,GAAG,CAAC,CAAC;AAExB,+DAA+D;AAC/D,MAAM,aAAa,GAAG,IAAI,CAAC;AAEpB,KAAK,UAAU,iCAAiC,CACrD,MAAc;IAEd,MAAM,MAAM,GAAe,EAAE,CAAC;IAC9B,KAAK,MAAM,QAAQ,IAAI,MAAM,CAAC,SAAS;QACrC,MAAM,CAAC,IAAI,CACT,MAAM,wCAAwC,CAAC,MAAM,EAAE,QAAQ,CAAC,CACjE,CAAC;IACJ,OAAO,MAAM,CAAC,IAAI,EAAE,CAAC;AACvB,CAAC;AATD,8EASC;AAEM,KAAK,UAAU,wCAAwC,CAC5D,MAAc,EACd,QAAkB;IAElB,MAAM,QAAQ,GAAG,MAAM,CAAC,UAAU,CAAC,QAAQ,CAAC,CAAC;IAC7C,IAAI,QAAQ,KAAK,SAAS;QAAE,OAAO,EAAE,CAAC;IACtC,MAAM,KAAK,GAAG,MAAM,WAAW,CAAC,wBAAwB,EAAE,CAAC;IAC3D,OAAO;QACL,MAAM,QAAQ,mBAAmB,QAAQ,EAAE;QAC3C,MAAM,QAAQ,qBAAqB,aAAa,EAAE;QAClD,MAAM,QAAQ,qBAAqB,KAAK,EAAE;KAC3C,CAAC;AACJ,CAAC;AAZD,4FAYC;AAED;;;;;;;GAOG;AACI,KAAK,UAAU,kBAAkB,CACtC,MAAc,EACd,SAAqB,EACrB,MAAc;;IAEd,MAAM,MAAM,GAAG,EAAE,CAAC;IAClB,MAAM,0BAA0B,GAAG,MAAM,6BAA6B,CACpE,MAAM,EACN,SAAS,EACT,MAAM,CACP,CAAC;IACF,MAAM,CAAC,IAAI,CACT,SAAS,0BAA0B,CAAC,MAAM,sCAAsC,CACjF,CAAC;IACF,IAAI,0BAA0B,CAAC,MAAM,KAAK,CAAC;QAAE,OAAO,MAAM,CAAC;IAE3D,MAAM,SAAS,GAAG,IAAI,CAAC,IAAI,CACzB,WAAW,CAAC,qBAAqB,EAAE,EACnC,YAAY,CACb,CAAC;IACF,KAAK,MAAM,QAAQ,IAAI,0BAA0B,EAAE;QACjD,MAAM,QAAQ,GAAG,IAAI,CAAC,IAAI,CAAC,SAAS,EAAE,QAAQ,CAAC,CAAC;QAChD,EAAE,CAAC,SAAS,CAAC,QAAQ,EAAE,EAAE,SAAS,EAAE,IAAI,EAAE,CAAC,CAAC;QAC5C,MAAM,CAAC,QAAQ,CAAC,GAAG,QAAQ,CAAC;KAC7B;IAED,IAAI,MAAM,WAAW,CAAC,wBAAwB,EAAE,EAAE;QAChD,MAAM,CAAC,IAAI,CACT,gEAAgE,CACjE,CAAC;QACF,OAAO,MAAM,CAAC;KACf;IAED,IAAI,OAAO,GAAG,SAAS,CAAC;IACxB,MAAM,SAAS,GAAG,OAAO,CAAC,GAAG,CAAC,iBAAiB,CAAC;IAChD,IACE,OAAO,CAAC,GAAG,CAAC,iBAAiB,KAAK,cAAc;QAChD,SAAS,KAAK,SAAS,EACvB;QACA,MAAM,KAAK,GAAG,IAAI,CAAC,KAAK,CAAC,EAAE,CAAC,YAAY,CAAC,IAAI,CAAC,OAAO,CAAC,SAAS,CAAC,EAAE,OAAO,CAAC,CAAC,CAAC;QAC5E,OAAO,GAAG,CAAA,MAAA,MAAA,KAAK,CAAC,YAAY,0CAAE,IAAI,0CAAE,GAAG,KAAI,OAAO,CAAC;KACpD;IACD,KAAK,MAAM,QAAQ,IAAI,SAAS,EAAE;QAChC,MAAM,QAAQ,GAAG,MAAM,CAAC,QAAQ,CAAC,CAAC;QAClC,IAAI,QAAQ,KAAK,SAAS;YAAE,SAAS;QACrC,uFAAuF;QACvF,MAAM,YAAY,GAAG,MAAM,QAAQ,CAAC,MAAM,EAAE,QAAQ,EAAE,OAAO,CAAC,CAAC;QAC/D,MAAM,CAAC,IAAI,CACT,oDAAoD,YAAY,EAAE,CACnE,CAAC;QACF,MAAM,KAAK,GAAG,MAAM,KAAK,CAAC,YAAY,CAAC,CAAC,QAAQ,CAAC,EAAE,YAAY,EAAE;YAC/D,MAAM,WAAW,CAAC,MAAM,EAAE,QAAQ,CAAC,EAAE,mDAAmD;SACzF,CAAC,CAAC;QACH,IAAI,KAAK,KAAK,SAAS,EAAE;YACvB,gFAAgF;YAChF,oFAAoF;YACpF,6EAA6E;YAC7E,MAAM,CAAC,IAAI,CAAC,4CAA4C,QAAQ,EAAE,CAAC,CAAC;YACpE,OAAO,MAAM,CAAC,QAAQ,CAAC,CAAC;SACzB;KACF;IAED,OAAO,MAAM,CAAC;AAChB,CAAC;AA/DD,gDA+DC;AAED;;;;;;GAMG;AACI,KAAK,UAAU,gBAAgB,CACpC,MAAc,EACd,MAAc,EACd,MAAc;IAEd,IAAI,CAAC,CAAC,MAAM,WAAW,CAAC,wBAAwB,EAAE,CAAC;QAAE,OAAO,KAAK,CAAC,CAAC,6CAA6C;IAEhH,MAAM,OAAO,GAA2B,EAAE,CAAC;IAC3C,KAAK,MAAM,QAAQ,IAAI,MAAM,CAAC,SAAS,EAAE;QACvC,MAAM,QAAQ,GAAG,MAAM,CAAC,UAAU,CAAC,QAAQ,CAAC,CAAC;QAC7C,IAAI,QAAQ,KAAK,SAAS;YAAE,SAAS;QACrC,MAAM,GAAG,GAAG,MAAM,QAAQ,CACxB,MAAM,EACN,QAAQ,EACR,OAAO,CAAC,GAAG,CAAC,UAAU,IAAI,SAAS,CACpC,CAAC;QACF,MAAM,CAAC,IAAI,CAAC,kDAAkD,GAAG,EAAE,CAAC,CAAC;QACrE,OAAO,CAAC,IAAI,CAAC,KAAK,CAAC,SAAS,CAAC,CAAC,QAAQ,CAAC,EAAE,GAAG,CAAC,CAAC,CAAC;KAChD;IACD,MAAM,OAAO,CAAC,GAAG,CAAC,OAAO,CAAC,CAAC;IAC3B,OAAO,IAAI,CAAC;AACd,CAAC;AArBD,4CAqBC;AAEM,KAAK,UAAU,6BAA6B,CACjD,MAAc,EACd,SAAqB,EACrB,MAAc;;IAEd,MAAM,MAAM,GAAe,EAAE,CAAC;IAC9B,IACE,CAAC,CAAC,MAAM,IAAA,yBAAkB,EAAC,MAAM,EAAE,gDAAuC,CAAC,CAAC;QAE5E,OAAO,MAAM,CAAC;IAChB,MAAM,aAAa,GAAG,MAAM,MAAM,CAAC,sBAAsB,EAAE,CAAC;IAC5D,KAAK,EAAE,KAAK,MAAM,IAAI,IAAI,SAAS,EAAE;QACnC,MAAM,qBAAqB,GAAG,aAAa,CAAC,UAAU,CAAC,IAAI,CAAC,CAAC;QAC7D,IAAI,qBAAqB,KAAK,SAAS,EAAE;YACvC,MAAM,CAAC,IAAI,CACT,GAAG,IAAI,6DAA6D,CACrE,CAAC;YACF,SAAS;SACV;QACD,IAAI,qBAAqB,CAAC,MAAM,KAAK,CAAC,EAAE;YACtC,MAAM,CAAC,IAAI,CACT,GAAG,IAAI,4DAA4D,CACpE,CAAC;YACF,SAAS;SACV;QACD,MAAM,SAAS,GAAG,qBAAqB,CAAC,CAAC,CAAC,CAAC;QAC3C,MAAM,gBAAgB,GACpB,MAAA,MAAA,MAAA,MAAA,SAAS,CAAC,iBAAiB,0CAAE,IAAI,0CAAE,UAAU,0CAAE,KAAK,0CAAE,UAAU,CAAC;QACnE,IAAI,gBAAgB,KAAK,SAAS,EAAE;YAClC,MAAM,CAAC,IAAI,CACT,GAAG,IAAI,uDAAuD,CAC/D,CAAC;YACF,SAAS;SACV;QACD,KAAK,MAAM,WAAW,IAAI,CAAC,KAAK,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE;YACnD,IAAI,CAAC,CAAC,WAAW,IAAI,gBAAgB,CAAC,EAAE;gBACtC,MAAM,CAAC,IAAI,CACT,GAAG,IAAI,2CAA2C,WAAW,UAAU,CACxE,CAAC;gBACF,SAAS,KAAK,CAAC;aAChB;SACF;QACD,MAAM,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC;KACnB;IACD,OAAO,MAAM,CAAC;AAChB,CAAC;AA7CD,sEA6CC;AAEM,KAAK,UAAU,iBAAiB,CACrC,UAA6C,EAC7C,MAAc;IAEd,IAAI;QACF,MAAM,KAAK,GAAG,MAAM,OAAO,CAAC,GAAG,CAC7B,MAAM,CAAC,MAAM,CAAC,UAAU,CAAC,CAAC,GAAG,CAAC,KAAK,EAAE,QAAQ,EAAE,EAAE;YAC/C,OAAO,IAAA,gBAAS,EAAiB,yBAAa,CAAC,CAAC,QAAQ,CAAC,CAAC;QAC5D,CAAC,CAAC,CACH,CAAC;QACF,OAAO,KAAK,CAAC,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,EAAE,EAAE,CAAC,CAAC,GAAG,CAAC,EAAE,CAAC,CAAC,CAAC;KACzC;IAAC,OAAO,CAAC,EAAE;QACV,MAAM,CAAC,OAAO,CAAC,uDAAuD,CAAC,EAAE,CAAC,CAAC;QAC3E,OAAO,CAAC,CAAC;KACV;AACH,CAAC;AAfD,8CAeC;AAED,KAAK,UAAU,QAAQ,CACrB,MAAc,EACd,QAAkB,EAClB,OAAe;IAEf,OAAO,GAAG,MAAM,WAAW,CAAC,MAAM,EAAE,QAAQ,CAAC,GA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\ No newline at end of file
diff --git a/src/trap-caching.ts b/src/trap-caching.ts
index 10b3bd4068..d5ae7d0da6 100644
--- a/src/trap-caching.ts
+++ b/src/trap-caching.ts
@@ -162,8 +162,20 @@ export async function getLanguagesSupportingCaching(
     return result;
   const resolveResult = await codeql.betterResolveLanguages();
   outer: for (const lang of languages) {
-    if (resolveResult.extractors[lang].length !== 1) continue;
-    const extractor = resolveResult.extractors[lang][0];
+    const extractorsForLanguage = resolveResult.extractors[lang];
+    if (extractorsForLanguage === undefined) {
+      logger.info(
+        `${lang} does not support TRAP caching (couldn't find an extractor)`
+      );
+      continue;
+    }
+    if (extractorsForLanguage.length !== 1) {
+      logger.info(
+        `${lang} does not support TRAP caching (found multiple extractors)`
+      );
+      continue;
+    }
+    const extractor = extractorsForLanguage[0];
     const trapCacheOptions =
       extractor.extractor_options?.trap?.properties?.cache?.properties;
     if (trapCacheOptions === undefined) {