fixup eventual logging

Author: lobsterkatie

packages/core/src/baseclient.ts

@@ -586,9 +586,13 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
         if (__DEBUG_BUILD__) {
           // If something's gone wrong, log the error as a warning. If it's just us having used a `SentryError` for
           // control flow, log just the message (no stack) as a log-level log.
-          const logLevel = (reason as SentryError).logLevel || 'warn';
-          const logee = logLevel === 'log' ? (reason as SentryError).message : reason;
-          logger[logLevel as 'log' | 'warn'](logee);
+          if (reason instanceof SentryError) {
+            // `SentryError`s are tagged as 'warn' by default, but can be marked as 'log' if they don't actually indicate
+            // a problem
+            logger[reason.logLevel as 'log' | 'warn'](reason.message);
+          } else {
+            logger.warn(reason);
+          }
         }
         return undefined;
       },