diff --git a/roaring.c b/roaring.c
index 1dff983..d0997f1 100644
--- a/roaring.c
+++ b/roaring.c
@@ -1,4 +1,4 @@
-/* auto-generated on Wed Sep 11 23:36:34 CST 2019. Do not edit! */
+/* auto-generated on Thu Mar 26 16:06:13 CST 2020. Do not edit! */
 #include "roaring.h"
 
 /* used for http://dmalloc.com/ Dmalloc - Debug Malloc Library */
@@ -643,8 +643,8 @@ int32_t difference_vector16(const uint16_t *__restrict__ A, size_t s_a,
     }
     if (i_a < s_a) {
         if(C == A) {
-          assert(count <= i_a);
-          if(count < i_a) {
+          assert((size_t)count <= i_a);
+          if((size_t)count < i_a) {
             memmove(C + count, A + i_a, sizeof(uint16_t) * (s_a - i_a));
           }
         } else {
@@ -4462,7 +4462,8 @@ run_container_t *run_container_from_array(const array_container_t *c) {
 /**
  * Convert the runcontainer to either a Bitmap or an Array Container, depending
  * on the cardinality.  Frees the container.
- * Allocates and returns new container, which caller is responsible for freeing
+ * Allocates and returns new container, which caller is responsible for freeing.
+ * It does not free the run container.
  */
 
 void *convert_to_bitset_or_array_container(run_container_t *r, int32_t card,
@@ -4480,7 +4481,7 @@ void *convert_to_bitset_or_array_container(run_container_t *r, int32_t card,
         }
         assert(card == answer->cardinality);
         *resulttype = ARRAY_CONTAINER_TYPE_CODE;
-        run_container_free(r);
+        //run_container_free(r);
         return answer;
     }
     bitset_container_t *answer = bitset_container_create();
@@ -4490,7 +4491,7 @@ void *convert_to_bitset_or_array_container(run_container_t *r, int32_t card,
     }
     answer->cardinality = card;
     *resulttype = BITSET_CONTAINER_TYPE_CODE;
-    run_container_free(r);
+    //run_container_free(r);
     return answer;
 }
 
@@ -8837,7 +8838,7 @@ bool roaring_bitmap_remove_run_compression(roaring_bitmap_t *r) {
                 int32_t card = run_container_cardinality(truec);
                 void *c1 = convert_to_bitset_or_array_container(
                     truec, card, &typecode_after);
-                shared_container_free((shared_container_t *)c);
+                shared_container_free((shared_container_t *)c);// will free the run container as needed
                 ra_set_container_at_index(&r->high_low_container, i, c1,
                                           typecode_after);
 
@@ -8845,6 +8846,7 @@ bool roaring_bitmap_remove_run_compression(roaring_bitmap_t *r) {
                 int32_t card = run_container_cardinality((run_container_t *)c);
                 void *c1 = convert_to_bitset_or_array_container(
                     (run_container_t *)c, card, &typecode_after);
+                run_container_free((run_container_t *)c);
                 ra_set_container_at_index(&r->high_low_container, i, c1,
                                           typecode_after);
             }
diff --git a/roaring.h b/roaring.h
index 6aa1e13..3b2e7f4 100644
--- a/roaring.h
+++ b/roaring.h
@@ -1,13 +1,13 @@
-/* auto-generated on Wed Sep 11 23:36:34 CST 2019. Do not edit! */
+/* auto-generated on Thu Mar 26 16:06:13 CST 2020. Do not edit! */
 /* begin file include/roaring/roaring_version.h */
 // /include/roaring/roaring_version.h automatically generated by release.py, do not change by hand 
 #ifndef ROARING_INCLUDE_ROARING_VERSION 
 #define ROARING_INCLUDE_ROARING_VERSION 
-#define ROARING_VERSION = 0.2.65,  
+#define ROARING_VERSION = 0.2.66,  
 enum { 
     ROARING_VERSION_MAJOR = 0,  
     ROARING_VERSION_MINOR = 2,  
-    ROARING_VERSION_REVISION = 65  
+    ROARING_VERSION_REVISION = 66  
 }; 
 #endif // ROARING_INCLUDE_ROARING_VERSION 
 /* end file include/roaring/roaring_version.h */
@@ -2880,7 +2880,7 @@ array_container_t *array_container_from_bitset(const bitset_container_t *bits);
 run_container_t *run_container_from_array(const array_container_t *c);
 
 /* convert a run into either an array or a bitset
- * might free the container */
+ * might free the container. This does not free the input run container. */
 void *convert_to_bitset_or_array_container(run_container_t *r, int32_t card,
                                            uint8_t *resulttype);
 
diff --git a/roaringbitmap--0.2.65.2--0.2.66.sql b/roaringbitmap--0.2.65.2--0.2.66.sql
new file mode 100644
index 0000000..e69de29
diff --git a/roaringbitmap--0.2.65.2.sql b/roaringbitmap--0.2.66.sql
similarity index 100%
rename from roaringbitmap--0.2.65.2.sql
rename to roaringbitmap--0.2.66.sql
diff --git a/roaringbitmap.c b/roaringbitmap.c
index 5de9d95..8dd6612 100644
--- a/roaringbitmap.c
+++ b/roaringbitmap.c
@@ -924,6 +924,9 @@ Datum
                 (errcode(ERRCODE_DATA_EXCEPTION),
                  errmsg("rb_or_trans outside transition context")));
 
+    // Fix bug at args are both null @20200326 ZEROMAX 
+    if (PG_ARGISNULL(0) && PG_ARGISNULL(1)) PG_RETURN_NULL();
+
     // Is the first argument a NULL?
     if (PG_ARGISNULL(0))
     {
@@ -965,6 +968,9 @@ Datum
                 (errcode(ERRCODE_DATA_EXCEPTION),
                  errmsg("rb_or_trans outside transition context")));
 
+    // Fix bug at args are both null @20200326 ZEROMAX 
+    if (PG_ARGISNULL(0) && PG_ARGISNULL(1)) PG_RETURN_NULL();
+
     // Is the first argument a NULL?
     if (PG_ARGISNULL(0))
     {
@@ -1004,10 +1010,14 @@ Datum
                 (errcode(ERRCODE_DATA_EXCEPTION),
                  errmsg("rb_and_trans outside transition context")));
 
+    // Fix bug at args are both null @20200326 ZEROMAX 
+    if (PG_ARGISNULL(0) && PG_ARGISNULL(1)) PG_RETURN_NULL();
+
     // Is the first argument a NULL?
     if (PG_ARGISNULL(0))
     {
         r1 = setup_roaringbitmap(aggctx);
+
     }
     else
     {
@@ -1052,6 +1062,9 @@ Datum
                 (errcode(ERRCODE_DATA_EXCEPTION),
                  errmsg("rb_and_trans outside transition context")));
 
+    // Fix bug at args are both null @20200326 ZEROMAX 
+    if (PG_ARGISNULL(0) && PG_ARGISNULL(1)) PG_RETURN_NULL();
+
     // Is the first argument a NULL?
     if (PG_ARGISNULL(0))
     {
@@ -1099,6 +1112,9 @@ Datum
                 (errcode(ERRCODE_DATA_EXCEPTION),
                  errmsg("rb_xor_trans outside transition context")));
 
+    // Fix bug at args are both null @20200326 ZEROMAX 
+    if (PG_ARGISNULL(0) && PG_ARGISNULL(1)) PG_RETURN_NULL();
+
     // Is the first argument a NULL?
     if (PG_ARGISNULL(0))
     {
@@ -1147,6 +1163,9 @@ Datum
                 (errcode(ERRCODE_DATA_EXCEPTION),
                  errmsg("rb_xor_trans outside transition context")));
 
+    // Fix bug at args are both null @20200326 ZEROMAX 
+    if (PG_ARGISNULL(0) && PG_ARGISNULL(1)) PG_RETURN_NULL();
+
     // Is the first argument a NULL?
     if (PG_ARGISNULL(0))
     {
@@ -1194,6 +1213,9 @@ Datum
                 (errcode(ERRCODE_DATA_EXCEPTION),
                  errmsg("rb_build_trans outside transition context")));
 
+    // Fix bug at args are both null @20200326 ZEROMAX 
+    if (PG_ARGISNULL(0) && PG_ARGISNULL(1)) PG_RETURN_NULL();
+
     // Is the first argument a NULL?
     if (PG_ARGISNULL(0))
     {
diff --git a/roaringbitmap.control b/roaringbitmap.control
index 1294430..6a76cde 100644
--- a/roaringbitmap.control
+++ b/roaringbitmap.control
@@ -1,5 +1,5 @@
 # roaringbitmap extension
 comment = 'Extension for RoaringBitmaps'
-default_version = '0.2.65.2'
+default_version = '0.2.66'
 module_pathname = '$libdir/roaringbitmap'
 relocatable = true
\ No newline at end of file