lib/plurimath/math/formula.rb in plurimath-0.2.8 vs lib/plurimath/math/formula.rb in plurimath-0.2.9

@@ -40,14 +40,14 @@
       def mathml_content
         value.map(&:to_mathml_without_math_tag)
       end
 
       def to_latex
-        value.map(&:to_latex).join(" ")
+        value&.map(&:to_latex)&.join(" ")
       end
 
       def to_html
-        value.map(&:to_html).join(" ")
+        value&.map(&:to_html)&.join(" ")
       end
 
       def omml_math_attrs
         {
           "xmlns:m": "http://schemas.openxmlformats.org/officeDocument/2006/math",