diff --git a/zathura/document.c b/zathura/document.c
index 7ed9acb..d094e2e 100644
--- a/zathura/document.c
+++ b/zathura/document.c
@@ -518,8 +518,13 @@ zathura_document_get_document_size(zathura_document_t* document,
 {
   g_return_if_fail(document != NULL && height != NULL && width != NULL);
 
-  const unsigned int npag  = zathura_document_get_number_of_pages(document);
-  const unsigned int ncol  = zathura_document_get_pages_per_row(document);
+  const unsigned int npag = zathura_document_get_number_of_pages(document);
+  const unsigned int ncol = zathura_document_get_pages_per_row(document);
+
+  if (npag == 0 || ncol == 0) {
+    return;
+  }
+
   const unsigned int c0    = zathura_document_get_first_page_column(document);
   const unsigned int nrow  = (npag + c0 - 1 + ncol - 1) / ncol;  /* number of rows */
   const unsigned int pad   = zathura_document_get_page_padding(document);
diff --git a/zathura/zathura.c b/zathura/zathura.c
index 8712c8a..8c493ae 100644
--- a/zathura/zathura.c
+++ b/zathura/zathura.c
@@ -791,8 +791,6 @@ document_open(zathura_t* zathura, const char* path, const char* uri, const char*
     goto error_out;
   }
 
-  zathura->document = document;
-
   const char* file_path        = zathura_document_get_path(document);
   unsigned int number_of_pages = zathura_document_get_number_of_pages(document);
 
@@ -802,6 +800,8 @@ document_open(zathura_t* zathura, const char* path, const char* uri, const char*
     goto error_free;
   }
 
+  zathura->document = document;
+
   /* read history file */
   zathura_fileinfo_t file_info = {
     .current_page = 0,