diff --git a/packages/string-templates/src/processors/preprocessor.js b/packages/string-templates/src/processors/preprocessor.js
index 131fb522f9..c984d61298 100644
--- a/packages/string-templates/src/processors/preprocessor.js
+++ b/packages/string-templates/src/processors/preprocessor.js
@@ -31,7 +31,8 @@ module.exports.processors = [
         statement = swapStrings(statement, startBraceIdx + lastIdx, 1, ".[")
       }
       lastIdx = startBraceIdx + 1
-      startBraceIdx = statement.substring(lastIdx + 1).indexOf("[")
+      const nextBraceIdx = statement.substring(lastIdx + 1).indexOf("[")
+      startBraceIdx = nextBraceIdx > 0 ? lastIdx + 1 + nextBraceIdx : -1
     }
     return statement
   }),