diff --git a/core/include/fpdfapi/fpdf_resource.h b/core/include/fpdfapi/fpdf_resource.h
index 92c4872..a7a6444 100644
--- a/core/include/fpdfapi/fpdf_resource.h
+++ b/core/include/fpdfapi/fpdf_resource.h
@@ -680,7 +680,7 @@
 {
 public:
 
-    CPDF_Color() :m_pCS(NULL), m_pBuffer(NULL), m_pDocument(NULL)
+    CPDF_Color() :m_pCS(NULL), m_pBuffer(NULL)
     {
     }
 
@@ -722,7 +722,6 @@
     void	ReleaseBuffer();
     void	ReleaseColorSpace();
     FX_FLOAT*			    m_pBuffer;
-    CPDF_Document*          m_pDocument;
 };
 #define PATTERN_TILING		1
 #define PATTERN_SHADING		2
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
index db384a7..c522dcd 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_colors.cpp
@@ -1292,8 +1292,8 @@
     if (m_pCS->GetFamily() == PDFCS_PATTERN) {
         PatternValue* pvalue = (PatternValue*)m_pBuffer;
         CPDF_Pattern* pPattern = pvalue->m_pPattern;
-        if (pPattern && m_pDocument) {
-            CPDF_DocPageData *pPageData = m_pDocument->GetPageData();
+        if (pPattern && pPattern->m_pDocument) {
+            CPDF_DocPageData *pPageData = pPattern->m_pDocument->GetPageData();
             if (pPageData && !pPageData->IsForceClear()) {
                 pPageData->ReleasePattern(pPattern->m_pPatternObj);
             }
@@ -1304,10 +1304,9 @@
 }
 void CPDF_Color::ReleaseColorSpace()
 {
-    if (m_pDocument && m_pCS && m_pCS->GetArray()) {
-        m_pDocument->GetPageData()->ReleaseColorSpace(m_pCS->GetArray());
+    if (m_pCS && m_pCS->m_pDocument && m_pCS->GetArray()) {
+        m_pCS->m_pDocument->GetPageData()->ReleaseColorSpace(m_pCS->GetArray());
         m_pCS = NULL;
-        m_pDocument = NULL;
     }
 }
 void CPDF_Color::SetColorSpace(CPDF_ColorSpace* pCS)
@@ -1318,13 +1317,11 @@
         }
         ReleaseColorSpace();
         m_pCS = pCS;
-        m_pDocument = pCS->m_pDocument;
         return;
     }
     ReleaseBuffer();
     ReleaseColorSpace();
     m_pCS = pCS;
-    m_pDocument = pCS->m_pDocument;
     if (m_pCS) {
         m_pBuffer = pCS->CreateBuf();
         pCS->GetDefaultColor(m_pBuffer);
@@ -1352,8 +1349,8 @@
         m_pBuffer = m_pCS->CreateBuf();
     }
     PatternValue* pvalue = (PatternValue*)m_pBuffer;
-    if (pvalue->m_pPattern && m_pDocument) {
-        CPDF_DocPageData *pDocPageData = m_pDocument->GetPageData();
+    if (pvalue->m_pPattern && pvalue->m_pPattern->m_pDocument) {
+        CPDF_DocPageData *pDocPageData = pvalue->m_pPattern->m_pDocument->GetPageData();
         if (pDocPageData && !pDocPageData->IsForceClear()) {
             pDocPageData->ReleasePattern(pvalue->m_pPattern->m_pPatternObj);
         }
@@ -1382,8 +1379,8 @@
     FXSYS_memcpy32(m_pBuffer, pSrc->m_pBuffer, m_pCS->GetBufSize());
     if (m_pCS->GetFamily() == PDFCS_PATTERN) {
         PatternValue* pvalue = (PatternValue*)m_pBuffer;
-        if (pvalue->m_pPattern && m_pDocument) {
-            pvalue->m_pPattern = m_pDocument->GetPageData()->GetPattern(pvalue->m_pPattern->m_pPatternObj, FALSE, &pvalue->m_pPattern->m_ParentMatrix);
+        if (pvalue->m_pPattern && pvalue->m_pPattern->m_pDocument) {
+            pvalue->m_pPattern = pvalue->m_pPattern->m_pDocument->GetPageData()->GetPattern(pvalue->m_pPattern->m_pPatternObj, FALSE, &pvalue->m_pPattern->m_ParentMatrix);
         }
     }
 }
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
index 16f0a9c..131edbe 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_doc.cpp
@@ -154,17 +154,6 @@
     FX_DWORD	nCount;
 
     m_bForceClear = bForceRelease;
-    pos = m_PatternMap.GetStartPosition();
-    while (pos) {
-        CPDF_Object* ptObj;
-        CPDF_CountedObject<CPDF_Pattern*>* ptData;
-        m_PatternMap.GetNextAssoc(pos, ptObj, ptData);
-        nCount = ptData->m_nCount;
-        if (bForceRelease || nCount < 2) {
-            delete ptData->m_Obj;
-            ptData->m_Obj = NULL;
-        }
-    }
     pos = m_FontMap.GetStartPosition();
     while (pos) {
         CPDF_Dictionary* fontDict;
@@ -233,6 +222,17 @@
             m_FontFileMap.RemoveKey(ftKey);
         }
     }
+    pos = m_PatternMap.GetStartPosition();
+    while (pos) {
+        CPDF_Object* ptObj;
+        CPDF_CountedObject<CPDF_Pattern*>* ptData;
+        m_PatternMap.GetNextAssoc(pos, ptObj, ptData);
+        nCount = ptData->m_nCount;
+        if (bForceRelease || nCount < 2) {
+            delete ptData->m_Obj;
+            ptData->m_Obj = NULL;
+        }
+    }
 }
 CPDF_Font* CPDF_DocPageData::GetFont(CPDF_Dictionary* pFontDict, FX_BOOL findOnly)
 {