Response classes seem incompatible with WebProfiler

Problem/Motivation

With WebProfiler enabled the font preview is broken. Opening the image path shows the following error:

TypeError: strripos(): Argument #1 ($haystack) must be of type string, bool given in strripos() (line 142 of modules/contrib/webprofiler/src/EventListener/ToolbarListener.php).
Drupal\webprofiler\EventListener\ToolbarListener->injectToolbar(Object, Object, Array) (Line: 126)
Drupal\webprofiler\EventListener\ToolbarListener->onKernelResponse(Object, 'kernel.response', Object)
call_user_func(Array, Object, 'kernel.response', Object) (Line: 93)
Drupal\tracer\EventDispatcher\TraceableEventDispatcher->dispatch(Object, 'kernel.response') (Line: 196)
Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 1) (Line: 184)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 74)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 42)
Drupal\tracer\StackMiddleware\TracesMiddleware->handle(Object, 1, 1) (Line: 34)
Drupal\webprofiler\StackMiddleware\WebprofilerMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 686)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes