diff --git a/api/src/org/labkey/api/dataiterator/CoerceDataIterator.java b/api/src/org/labkey/api/dataiterator/CoerceDataIterator.java
index f900733f5eb..3e5234a8ade 100644
--- a/api/src/org/labkey/api/dataiterator/CoerceDataIterator.java
+++ b/api/src/org/labkey/api/dataiterator/CoerceDataIterator.java
@@ -17,6 +17,7 @@
 
 import org.labkey.api.collections.CaseInsensitiveHashSet;
 import org.labkey.api.data.ColumnInfo;
+import org.labkey.api.data.JdbcType;
 import org.labkey.api.data.MultiValuedForeignKey;
 import org.labkey.api.data.TableInfo;
 import org.labkey.api.exp.PropertyType;
@@ -87,4 +88,11 @@ else if (to.getFk() instanceof MultiValuedForeignKey)
             }
         }
     }
+
+    // Ignore conversion exceptions during coercion and just pass back the original value.
+    @Override
+    protected Object handleConversionException(String fieldName, Object value, JdbcType target, Exception x)
+    {
+        return value;
+    }
 }
diff --git a/api/src/org/labkey/api/dataiterator/SimpleTranslator.java b/api/src/org/labkey/api/dataiterator/SimpleTranslator.java
index 593b9c38f97..a589029b612 100644
--- a/api/src/org/labkey/api/dataiterator/SimpleTranslator.java
+++ b/api/src/org/labkey/api/dataiterator/SimpleTranslator.java
@@ -178,7 +178,7 @@ protected boolean validMissingValue(String mv)
         return _missingValues.containsKey(mv);
     }
 
-    protected Object addConversionException(String fieldName, @Nullable Object value, @Nullable JdbcType target, Exception x)
+    protected Object handleConversionException(String fieldName, @Nullable Object value, @Nullable JdbcType target, Exception x)
     {
         String msg;
         if (x instanceof ConversionExceptionWithMessage)
@@ -651,7 +651,7 @@ final public Object get()
             }
             catch (ConversionException x)
             {
-                return addConversionException(fieldName, value, type, x);
+                return handleConversionException(fieldName, value, type, x);
             }
         }
 
@@ -1913,7 +1913,7 @@ public boolean next() throws BatchValidationException
             catch (ConversionException x)
             {
                 // preferable to handle in call()
-                _row[i] = addConversionException(_outputColumns.get(i).getKey().getName(), null, null, x);
+                _row[i] = handleConversionException(_outputColumns.get(i).getKey().getName(), null, null, x);
             }
             catch (RuntimeException x)
             {