diff --git a/src/common/basic/compiler.ts b/src/common/basic/compiler.ts
index 9f9a8a05..ed2b02e9 100644
--- a/src/common/basic/compiler.ts
+++ b/src/common/basic/compiler.ts
@@ -1116,7 +1116,7 @@ export class BASICParser {
             for (var arrdim of arr.args) {
                 if (arrdim.valtype != 'number')
                     this.compileError(`Array dimensions must be numeric.`, arrdim.$loc);
-                if (isLiteral(arrdim) && arrdim.value < this.opts.defaultArrayBase)
+                if (isLiteral(arrdim) && typeof arrdim.value === 'number' && arrdim.value < this.opts.defaultArrayBase)
                     this.compileError(`An array dimension cannot be less than ${this.opts.defaultArrayBase}.`, arrdim.$loc);
             }
         });