diff --git a/tex/latex/biblatex/biblatex.sty b/tex/latex/biblatex/biblatex.sty
index 2a88b29d..c9cece59 100644
--- a/tex/latex/biblatex/biblatex.sty
+++ b/tex/latex/biblatex/biblatex.sty
@@ -15165,13 +15165,16 @@
 \def\blx@minxrefs{2}
 
 \DeclareBibliographyOption[string]{pageseq}{%
+  \togglefalse{blx@seq}\togglefalse{blx@allsq}\togglefalse{blx@twosq}%
   \ifstrequal{#1}{all+}
-    {\toggletrue{blx@seq}\toggletrue{blx@allsq}\togglefalse{blx@twosq}}% all+
+    {\toggletrue{blx@seq}\toggletrue{blx@allsq}}% all+
     {\ifstrequal{#1}{three+}
-       {\toggletrue{blx@seq}\togglefalse{blx@allsq}\togglefalse{blx@twosq}}% three+
+       {\toggletrue{blx@seq}}% three+
        {\ifstrequal{#1}{two+}
-          {\toggletrue{blx@seq}\togglefalse{blx@allsq}\toggletrue{blx@twosq}}% two+
-          {\togglefalse{blx@seq}\togglefalse{blx@allsq}\togglefalse{blx@twosq}}% none
+          {\toggletrue{blx@seq}\toggletrue{blx@twosq}}% two+
+          {\ifstrequal{#1}{none}{}{% none
+             \blx@warning{Invalid pageseq value `#1'\MessageBreak
+                          Falling back to default.}}}%
        }%
     }%
 }