diff --git a/lib/entry-points.js b/lib/entry-points.js
index aeb99eb43..5ab2e57fe 100644
--- a/lib/entry-points.js
+++ b/lib/entry-points.js
@@ -177439,7 +177439,13 @@ async function getCodeQLForCmd(logger2, cmd, checkVersion) {
     },
     async diagnosticsExport(sarifFile, automationDetailsId, config, diagnosticDir) {
       let configPath = getGeneratedCodeScanningConfigPath(config);
-      if (diagnosticDir !== void 0 && !fs17.existsSync(configPath)) {
+      if (!fs17.existsSync(configPath)) {
+        logger2.warning(
+          [
+            `Expected a configuration file at '${configPath}', which does not exist.`,
+            "Continuing with diagnostics export anyway, without a configuration file."
+          ].join(" ")
+        );
         configPath = void 0;
       }
       const args = [
diff --git a/src/codeql.ts b/src/codeql.ts
index 7595e604a..b88144a25 100644
--- a/src/codeql.ts
+++ b/src/codeql.ts
@@ -927,7 +927,13 @@ async function getCodeQLForCmd(
       let configPath: string | undefined =
         getGeneratedCodeScanningConfigPath(config);
 
-      if (diagnosticDir !== undefined && !fs.existsSync(configPath)) {
+      if (!fs.existsSync(configPath)) {
+        logger.warning(
+          [
+            `Expected a configuration file at '${configPath}', which does not exist.`,
+            "Continuing with diagnostics export anyway, without a configuration file.",
+          ].join(" "),
+        );
         configPath = undefined;
       }