diff --git a/src/main/java/org/grobid/core/utilities/WordsToNumber.java b/src/main/java/org/grobid/core/utilities/WordsToNumber.java
index e9d7c623..43d084c0 100644
--- a/src/main/java/org/grobid/core/utilities/WordsToNumber.java
+++ b/src/main/java/org/grobid/core/utilities/WordsToNumber.java
@@ -35,8 +35,8 @@ public class WordsToNumber {
     private final String VALUES_PATH = "lexicon/en/values.json";
 
     private final Pattern NUMERIC_PATTERN = Pattern.compile("\\b(?:\\d+(?:[.,]\\d+)*|\\d+[.,]?\\d*\\b)\\b", Pattern.CASE_INSENSITIVE);
-    private final Pattern OUT_OF_PATTERN_NUMBERS = Pattern.compile("([0-9.,]+)( out)? of (the )?([0-9.,]+)", Pattern.CASE_INSENSITIVE);
-    private final Pattern OUT_OF_PATTERN_ALPHABETIC = Pattern.compile("([A-Za-z ]+) out of ([a-z]+ )?([A-Za-z]+)", Pattern.CASE_INSENSITIVE);
+    private final Pattern OUT_OF_PATTERN_NUMBERS = Pattern.compile("([0-9.,]+)( out)? of ([a-z]+ )?([0-9.,]+)", Pattern.CASE_INSENSITIVE);
+    private final Pattern OUT_OF_PATTERN_ALPHABETIC = Pattern.compile("([A-Za-z ]+) ( out)? of ([a-z]+ )?([A-Za-z]+)", Pattern.CASE_INSENSITIVE);
 
     private static List<String> bases = null;
     private static List<String> tens = null;
@@ -199,8 +199,14 @@ public BigDecimal normalize(String text, Locale locale) throws NormalizationExce
         } else if (OUT_OF_PATTERN_NUMBERS.matcher(text).find()) {
             Matcher m = OUT_OF_PATTERN_NUMBERS.matcher(text);
             m.matches();
-            String numerator = m.group(1);
-            String denominator = m.group(m.groupCount());
+            String numerator = "";
+            String denominator = "";
+            try {
+                numerator = m.group(1);
+                denominator = m.group(m.groupCount());
+            } catch(Exception e){
+                throw new NormalizationException("Cannot process the expression '" + text + "'. Skipping.");
+            }
 
             BigDecimal division = null;
             BigDecimal numeratorAsBigDecimal = null;
@@ -219,31 +225,21 @@ public BigDecimal normalize(String text, Locale locale) throws NormalizationExce
             } catch (Exception e) {
                 throw new NormalizationException("Cannot process the values '" + text + "'. The conversion is failing. Skipping them.");
             }
-
-//            catch (NumberFormatException nfe) {
-//
-//
-//                String cleanedNumerator = formatter.parse(numerator.);
-//                String cleanedDenominator = StringUtils.replaceChars(denominator, ",.", "");
-//                try {
-//                    division = new BigDecimal(cleanedNumerator).divide(new BigDecimal(cleanedDenominator));
-//                } catch (ArithmeticException ae) {
-//                    division = new BigDecimal(cleanedNumerator).divide(new BigDecimal(cleanedDenominator), 10, BigDecimal.ROUND_HALF_UP);
-//                } catch (Exception e) {
-//                    throw new NormalizationException("Cannot process the values '" + text + "'. The conversion is failing. Skipping them.");
-//                }
-//            }
             return division;
         } else if (OUT_OF_PATTERN_ALPHABETIC.matcher(text).find()) {
             Matcher m = OUT_OF_PATTERN_ALPHABETIC.matcher(text);
             m.matches();
-            String numerator = m.group(1);
-            String denominator = m.group(m.groupCount());
             BigDecimal division = null;
             try {
-                division = convertIntegerPart(numerator).divide(convertIntegerPart(denominator));
-            } catch (ArithmeticException ae) {
-                division = convertIntegerPart(numerator).divide(convertIntegerPart(denominator), 10, BigDecimal.ROUND_HALF_UP);
+                String numerator = m.group(1);
+                String denominator = m.group(m.groupCount());
+                try {
+                    division = convertIntegerPart(numerator).divide(convertIntegerPart(denominator));
+                } catch (ArithmeticException ae) {
+                    division = convertIntegerPart(numerator).divide(convertIntegerPart(denominator), 10, BigDecimal.ROUND_HALF_UP);
+                }
+            } catch (Exception e) {
+                throw new NormalizationException("Cannot process the expression '" + text + "'. Skipping.");
             }
             return division;
         } else if (StringUtils.isNotBlank(numericPart)) {
diff --git a/src/test/kotlin/org/grobid/core/utilities/WordsToNumberTest.kt b/src/test/kotlin/org/grobid/core/utilities/WordsToNumberTest.kt
index 11db1809..8d62a426 100644
--- a/src/test/kotlin/org/grobid/core/utilities/WordsToNumberTest.kt
+++ b/src/test/kotlin/org/grobid/core/utilities/WordsToNumberTest.kt
@@ -219,4 +219,12 @@ class WordsToNumberTest {
         MatcherAssert.assertThat(number, Is.`is`(BigDecimal("0.0617928044")))
     }
 
+    @Test(expected = NormalizationException::class)
+    @Throws(Exception::class)
+    fun testErrorCase_3() {
+        val input = "one out of currently 62"
+        val number = target.normalize(input, Locale.ENGLISH)
+        MatcherAssert.assertThat(number, Is.`is`(BigDecimal("0.01612903226")))
+    }
+
 }
\ No newline at end of file