diff --git a/run.lisp b/run.lisp
index 4f05fdc..6b4608e 100644
--- a/run.lisp
+++ b/run.lisp
@@ -118,7 +118,8 @@
   (let ((string (escaped-string-value string)))
     (when (or (string^= " " string)
               ;; Don't insert spaces before punctuation.
-              (not (alpha-char-p (alexandria:first-elt string))))
+              (and (not (alexandria:emptyp string))
+                   (not (alpha-char-p (alexandria:first-elt string)))))
       (cancel-space)))
   (call-next-method)
   (values))
diff --git a/tests.lisp b/tests.lisp
index 92040f3..176da3d 100644
--- a/tests.lisp
+++ b/tests.lisp
@@ -850,3 +850,7 @@ bar</pre>"
        (spinneret:with-html-string
          (:span "Click the " (:a :href "https://google.com" ) "."))
        "<span>Click the <a href=\"https://google.com\"></a>.</span>")))
+
+(test html-tag-empty-string
+  (finishes
+    (spinneret:with-html-string (:style ""))))