diff --git a/solr/core/src/java/org/apache/solr/search/facet/HLLAgg.java b/solr/core/src/java/org/apache/solr/search/facet/HLLAgg.java
index 62382cbe007..f85b0e5d610 100644
--- a/solr/core/src/java/org/apache/solr/search/facet/HLLAgg.java
+++ b/solr/core/src/java/org/apache/solr/search/facet/HLLAgg.java
@@ -119,6 +119,7 @@ public void merge(Object facetResult, Context mcontext) {
       } else {
         aggregate.union(subHLL);
       }
+      answer = -1;
     }
 
     private long getLong() {
diff --git a/solr/core/src/java/org/apache/solr/search/facet/PercentileAgg.java b/solr/core/src/java/org/apache/solr/search/facet/PercentileAgg.java
index 6c0c3db02ba..0ac1461e355 100644
--- a/solr/core/src/java/org/apache/solr/search/facet/PercentileAgg.java
+++ b/solr/core/src/java/org/apache/solr/search/facet/PercentileAgg.java
@@ -523,6 +523,7 @@ public void merge(Object facetResult, Context mcontext) {
       } else {
         digest.add(subDigest);
       }
+      sortVal = null;
     }
 
     @Override
diff --git a/solr/core/src/java/org/apache/solr/search/facet/UniqueAgg.java b/solr/core/src/java/org/apache/solr/search/facet/UniqueAgg.java
index 1f41617dd2e..7f1a9caeb51 100644
--- a/solr/core/src/java/org/apache/solr/search/facet/UniqueAgg.java
+++ b/solr/core/src/java/org/apache/solr/search/facet/UniqueAgg.java
@@ -98,6 +98,7 @@ public void merge(Object facetResult, Context mcontext) {
       shardsMissingSum += unique - valsListed;
       shardsMissingMax = Math.max(shardsMissingMax, unique - valsListed);
       // TODO: somehow get & use the count in the bucket?
+      answer = -1;
     }
 
     private long getLong() {